Nature of Earth: An Introduction to Geology

Course No. 1700
Professor John J. Renton, Ph.D.
West Virginia University
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Course No. 1700
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What Will You Learn?

  • numbers Probe the eye-opening origins of the universe and the solar system.
  • numbers Learn about the formation, classification and identification of minerals.
  • numbers Look at how groundwater is produced and contaminated, as well as its impact on geology.
  • numbers Study earthquakes, faults, joints, and the formation of mountain ranges.
  • numbers Study the economic geology of coal and petroleum.

Course Overview

The drama of geology is all around you. Have you ever been to Yellowstone National Park? If so, you have stood on a catastrophe in the making. The central region of the park is inside a collapsed volcanic crater that pulses with the hidden energy of magma deep below that will eventually explode in an eruption surpassing any in recorded history. Or have you ever driven in the rolling hills of the Piedmont region that extends from New Jersey to Alabama? Then you have crossed the core of an ancient mountain range that once rivaled the Himalayas. Now almost completely eroded away, these peaks were created 300 million years ago in the collision of tectonic plates that formed the supercontinent of Pangaea. Or have you ever noticed something as simple as tipped fence posts or leaning retaining walls? If so, then you have witnessed one of the most powerful and irresistible agents of geologic change, the ubiquitous force of gradual erosion called mass wasting.

A Science That Is Intuitive, Accessible, Concrete, and Exciting

Wherever you live or travel, geology is everywhere. Wouldn't you like to know how to read the rocks and landscape; how to make sense of debates over natural resources; and how to appreciate the "deep time" that governs a geologist's sweeping perspective?

These 36 half-hour lectures are your initiation into the geological world that lies just outside your door. The Nature of Earth: An Introduction to Geology introduces you to physical geology, the study of Earth's minerals, rocks, soils, and the processes that operate on them through time.

No other science deals more practically with the world on which we live, telling us where to dig a well; when to add lime to soil; how gold, oil, and other valuable minerals are formed and where to find them; what kinds of structures are safest in an earthquake zone; and why some active volcanoes are deadlier than others—far deadlier.

Geology also unlocks the history that lies hidden in the land all around us—in a piece of marble, a hillside, a handful of sand, the rock layers of a road cut, or the jagged peaks of a mountain range.

And for anyone who feels hesitant about the inherent complexity of sciences such as biology and physics, geology is surprisingly intuitive, accessible, and concrete. At the same time, it has the excitement of a never-ending detective story, replete with clues to the complex past of our planet.

Learn the Principles from a Master Educator

Geologists themselves are much like their subject matter: plainspoken, no-nonsense, rugged, and with a tinge of romanticism. This accurately describes your instructor for this course, Professor John J. Renton, an award-winning educator at West Virginia University, where he holds the Eberly Family Chair for Distinguished Teaching.

A widely respected expert on the geology of coal, Professor Renton's first love is teaching introductory geology, which he has pursued at West Virginia University with enthusiasm and creativity for more than 40 years. He recalls that as a young faculty member he set aside his lecture notes to try something that would encourage more involvement among his students. He decided to approach each class as an actor would a one-act play. Ever since, he prepares a script, rehearses it for hours, and then destroys it afterward to avoid using the same presentation year after year.

You will find Dr. Renton spontaneous, easy to follow, funny, and extremely well organized. He has a gift for picking simple analogies that make complicated concepts clear and memorable. For example:

  • The moving sidewalk: We have all heard of continental drift, but do the continents really move? Not exactly, says Professor Renton. They are like passengers on a moving sidewalk: the passengers don't move, but the sidewalk does. In the same way, the continents are being carried atop the slowly moving plates of Earth's crust.
  • The fish poacher: What makes Earth's plates move? A fish poacher—an elongated pot designed to fit over two burners on a stove—illustrates the principle in action. In a fish poacher, two heat sources produce alternating cells of rising and sinking water. Similarly, Earth's internal heat creates alternating cells of rising and sinking magma. Earth's plates are driven apart where the currents are rising, and they are forced together where the currents are sinking.
  • The bottle of champagne: A volcano erupts explosively for the same reason that a too-hastily-opened bottle of champagne spews out much of its contents. As magma nears the surface, built-up pressure is suddenly released, causing dissolved gases to come out of solution and expand explosively. In champagne, something similar happens when the cork is popped.

An Innovative Curriculum

As an old hand at teaching new students in geology, Professor Renton has developed an innovative and highly effective curriculum.

After beginning with an overview of Earth's place in the universe, you move directly to the most important unifying concept ever developed in the science of geology: plate tectonics. An understanding of this beautiful idea places other topics such as mountain building and seismology in crystal-clear perspective.

With this "big picture" introduction complete, you shift to the microworld of molecules, atoms, and subatomic particles to gain a basic understanding of minerals, which are the building blocks of rocks and soils. From there you move to the three types of rocks: igneous, sedimentary, and metamorphic.

Dr. Renton does not ignore terminology, and you will acquire a geological vocabulary that includes such terms as "mafic" and "felsic" (classifications of igneous rock), "lithification" (the process that turns sand into sandstone, for example), and "gneiss" (the most abundant of all metamorphic rocks).

He always explains and puts concepts into context so that you will genuinely understand why "granitic" magma very rarely rises to the surface, but when it does, it produces an eruption of unimaginable violence—and also why the marker for such an event having occurred in the past is a fine grained rock called "rhyolite."

Explore a Range of Topics in Geology

Equipped with knowledge of both the large and small scales, you then venture into the field to explore: volcanism, mass wasting, weathering and soils, the sculpting of the land, groundwater, rock deformation and geologic structures, earthquakes, mountains, and the economic geology of coal and petroleum.

Covering the bulk of the course, these lectures take you to some fascinating places—from the bituminous coal fields of Dr. Renton's home state of West Virginia to the mid-ocean ridges, the most prominent feature on our planet (if you drain away the water). But you also explore your own backyard in lectures that focus on soils and groundwater, two issues that are critically important to everyone.The ability of grain crops to flourish in some areas and not others will suddenly make sense, and so will the rising, falling, and sometimes puzzling behavior of the water table.

In this section of the course, you also put your knowledge of plate tectonics to work, addressing such questions as:

  • How do you recognize a killer volcano? Because of differing magma chemistry, volcanoes along the margin of colliding plates are much more dangerous than those where plates are pulling apart. The former include Mount St. Helens in the United States and Mount Pinatubo in the Philippines, among many others. The latter include the numerous active volcanoes on Iceland, which rarely harm anyone.
  • What is the evidence that a collision formed the Appalachian Mountains? As you travel west across the Piedmont, the Blue Ridge Mountains, the Shenandoah Valley, and the Appalachians, the crumpling of rock strata becomes increasingly less pronounced, showing that the energy that went into producing the folds came from the east—exactly what you would expect for a collision of continents occurring in what is now the Piedmont region.
  • Where is the colliding continent that produced the Appalachians? It's called Africa. The Atlas Mountains in northwest Africa are structurally a mirror image of the Appalachians. Africa separated from North America in the breakup of Pangaea that began about 180 million years ago.
  • What caused the bend in the Hawaiian Island–Emperor Seamount chain? The motion of the Pacific plate over a geologic hot spot created a chain of islands and underwater seamounts. In the middle of the chain is a sharp bend. Why? The bend coincides with the collision of India into Asia 45 million years ago, an event that produced the Himalayan Mountains and apparently knocked the Pacific plate off kilter.
  • Where are new mountain ranges likely to form? Given the present motion of the Earth's plates, future mountain building will occur when Africa runs into Europe and, after that, when Australia collides with China.

Lessons for a Lifetime

In his introductory lecture, Professor Renton reads an e-mail he received from a former student of more than 30 years ago who marvels: "Hardly a week passes that something doesn't cause me to think about your classes.

"Though I never became a geologist," the correspondent writes, "I often draw upon what you lectured about. I can explain to my daughter why this beach has sand and that beach has rocks, or how it is that rivers' courses are the way they are. Well, she thinks I'm pretty bright. But in fact, I'm just passing on what I got from Physical Geology."

"I think that really spells it out," says Professor Renton. "What I'd like you to get out of this course is information that you will take with you for the rest of your life, wherever you go in the world—I don't care whether it's a trip to the office or on vacation—so that you can look at the world that passes you by in a little bit different fashion, understanding it better, appreciating it better."

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36 lectures
 |  Average 30 minutes each
  • 1
    Origin of the Universe
    In the beginning, there was no need for geology because there were no rocks, minerals, or Earth. This lecture takes a "big picture" look at the formation and early evolution of the universe. x
  • 2
    Origin of the Solar System
    The planets formed from a disc of cosmic dust rotating around the Sun. The composition of the planets varies. Those nearest the Sun are made of rock, while those most distant are made of gases. x
  • 3
    Continental Drift
    Until the 20th century, geologists believed that the size, shape, and location of the continents had been fixed in their present configuration for billions of years. Then the theory of plate tectonics changed everything. x
  • 4
    Plate Tectonics
    This lecture describes plate tectonics—the rifting of continents and spreading of the sea floor; the force that drives this process; and the cyclic creation, breaking up, and reformation of supercontinents. x
  • 5
    The Formation of Minerals
    A full understanding of Earth's origin, the evolution of its surface, and how processes shape the land requires knowledge of minerals, how they form, and their basic classification. x
  • 6
    Classification of Minerals
    Minerals are classified by their dominant, negatively charged grouping (anion). By far, the major rock-forming minerals are silicates built around the silicate anion. All other minerals are classified as non-silicates. x
  • 7
    The Identification of Minerals
    For the average geologist in the field, mineral identification is made based on a series of physical properties. Color streak, cleavage, acid reaction, and hardness are four such tests. x
  • 8
    Kinds of Rocks
    Of the three types of rock—igneous, sedimentary, and metamorphic—igneous rocks constitute 80 percent of Earth's crust. They are classified and named based on their texture and mineral composition. x
  • 9
    Sedimentary Rocks
    Sedimentary rocks form from the products of weathering and cover 75 percent of Earth's land surface. As a result, they are the type of rock that is normally seen exposed at Earth's surface. x
  • 10
    Metamorphic Rocks
    A metamorphic rock is any rock that forms from a previously existing rock as the result of heat, pressure, and chemically active fluids. This process takes place only at great depth. x
  • 11
    Volcanic Activity
    This lecture introduces volcanism, which is associated with three types of sites: convergent plate margins, divergent plate margins, and hot spots. The composition of magma is crucial in determining the intensity of an eruption. x
  • 12
    Phases of Volcanic Activity
    The site of an eruption and the type of magma involved govern whether the resulting volcano will be a cinder cone, a shield volcano, or a strato- or composite volcano. Eruptions are further classified based on severity. x
  • 13
    The Hawaiian Islands and Yellowstone Park
    The Hawaiian Islands resulted from the movement of the Pacific plate over a volcanic hot spot. Yellowstone Park also sits over a hot spot that caused violent eruptions in prehistory. Another such eruption is likely. x
  • 14
    Mass Wasting—Gravity at Work
    Although mass wasting is one of the most important processes responsible for the evolution of the landscape, most people are unaware of its existence. The driving force of mass wasting is gravity. x
  • 15
    Mass Wasting Processes
    This lecture describes how mass wasting works and where to observe it. Although flows, slides, and falls account for the most dramatic forms of mass wasting, by far the greatest change is achieved by creep. x
  • 16
    Weathering is any process whereby rocks either disintegrate or decompose. The primary agent of physical weathering is the freezing and thawing of water, known as frost wedging. x
  • 17
    Soils and the Clay Minerals
    This lecture explores why soils are so critical to sustaining plant life. Clay minerals turn out to be the key component. Different climates have characteristic soil types, some of which are ideal for agriculture. x
  • 18
    Climate and the Type of Soils
    Soil is the end product of a complex series of factors, the most important of which is climate. The type of soil that forms is controlled by the combination of annual precipitation and temperature. x
  • 19
    Streams—The Major Agent of Erosion
    Despite holding only a tiny fraction of the world's fresh water, streams are the major agent of erosion wherever water can exist, including the desert. Streams are either interior (terminating inland) or exterior (ending in the ocean). x
  • 20
    Sculpting of the Landscape
    Surprisingly, there is no scientific consensus on the process of landscape evolution. One prominent theory, proposed by William Davis, sees land evolving through three stages of maturity due to stream erosion. x
  • 21
    Stream Erosion in Arid Regions
    With minor modifications, Davis's theory on the three stages of a stream's life holds true for arid regions as well as humid regions. Nevada is typical of the process of stream erosion in arid regions. x
  • 22
    Ice Sculpts the Final Scene
    Glaciers are second only to streams as an agent of erosion. In areas such as the Alps and Canadian Rockies, the combined effects of stream and glacial erosion have carved some of the most spectacular scenery on the planet. x
  • 23
    Earth's largest readily available source of fresh water is groundwater. This lecture looks at the types of rock most suitable for storing groundwater. Those that produce water most easily are classified as aquifers. x
  • 24
    The Production of Groundwater
    Overproduction of an aquifer usually results in the lowering of the water table. Groundwater is not a renewable resource. It may take hundreds of thousands of years to replace a gallon of groundwater with a new gallon. x
  • 25
    Karst Topography
    One of the most spectacular results of groundwater in action is karst topography—irregular topography created by the surface and groundwater dissolution of underlying soluble rock, usually limestone. x
  • 26
    Groundwater Contamination
    Nearly every human activity, from fertilizing yards to parking cars, has the potential to contaminate groundwater. Poorly designed and built landfills rank high among potential contaminants. x
  • 27
    Rock Deformation
    Deformation is any process in which rock changes in size and/or shape. The three types of deformation are elastic, plastic, and brittle, corresponding to rocks that "bounce back," bend, and break. x
  • 28
    The Geologic Structures
    Rock structures form as a result of the application of stress beyond the strength of the rock. The three basic rock structures are folds, faults, and joints. This lecture focuses on folds, which are caused by compression. x
  • 29
    Faults and Joints
    Faults and joints comprise the two types of brittle deformation. Rocks move along faults. There is little or no movement along joints. One well-known fault is the San Andreas, a strike-slip fault. x
  • 30
    Earthquakes occur in the same regions as the most violent volcanoes. Both result from the activity of convergent plate or divergent plate margins. Convergent plate margins produce the most violent of both events. x
  • 31
    Damage from Earthquakes
    The intensity of an earthquake refers to the observed results of the quaking and the amount of damage. An earthquake's magnitude measures the amount of Earth movement. Tsunamis are an earthquake-generated phenomenon. x
  • 32
    Earthquakes have been detected for centuries with simple devices, but the ability to study the full impact of earthquakes awaited the invention of a seismograph that could not only detect but actually measure Earth movement. x
  • 33
    The Formation of Mountains
    Mountains are of four types: volcanic, domal, block-fault, and foldbelt. The most impressive are foldbelt mountains such as the Himalayas, which are created by colliding plates at zones of subduction. x
  • 34
    Orogenic Styles
    Orogeny refers to the processes that create foldbelt mountains. These form under three scenarios: ocean-continent collisions, ocean-island arc-continent collisions, and continent-continent collisions. x
  • 35
    Economic Geology of Coal
    Coal comes from wood that has been preserved in environments where oxygen and microbial activity is low. Coal is ranked by its carbon content, which varies widely in the abundant deposits in the United States. x
  • 36
    Economic Geology of Petroleum
    Petroleum is formed when marine material is buried in porous rock capped by an impermeable layer. Predictions about the inevitable decrease and disappearance of oil resources appear to be all too accurate. x

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Your professor

John J. Renton

About Your Professor

John J. Renton, Ph.D.
West Virginia University
Dr. John J. Renton is Professor of Geology at West Virginia University where he has been teaching for more than 40 years. He earned his bachelor's degree in Chemistry from Waynesburg College and went on to earn his master's degree and Ph.D. in Geology from West Virginia University. Professor Renton is the recipient of several awards for his success in teaching, including the Outstanding Educator Award from the Eastern...
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Nature of Earth: An Introduction to Geology is rated 4.2 out of 5 by 192.
Rated 4 out of 5 by from Excellent content, interestingly presented A very good course, interesting, easy to follow, and well presented. Professor Renton is a kick—opinionated and a bit eccentric, but an articulate and knowledgeable presenter who always makes the distinction clear between documentable fact and his opinion. It’s easy to see why he’s a popular professor—especially, I would predict, among underclassmen and non-geology majors. He’s from West Virginia and much of his real-world illustrative material focuses on Appalachia, but there’s a wealth of information in the course and I feel like I learned a lot.
Date published: 2020-03-17
Rated 5 out of 5 by from Nature of Earth: Intro to Geology I love learning a new topic. The professor is excellent. Explaining some very difficult topics in terms that I understand and can keep up with. He has the course progressing as a continuation of the topic; start to present.
Date published: 2020-02-22
Rated 5 out of 5 by from Great gift! My husband commented that he regretted not taking a geology course in college so I bought this course as a gift for him. He's really enjoying it, and says the professor is quite good.
Date published: 2020-01-04
Rated 5 out of 5 by from Thorough, pertinent , easy to follow!! Excellent course; learned so much about what I see in landscapes.
Date published: 2020-01-02
Rated 5 out of 5 by from 5 stars for this Intro to Geology I have 2 masters and a PhD and recently retired. I always wanted a good basic course in Geology, ever since I worked with Geologists in Antarctica, as a pilot supporting the National Science Foundation. I found their work fascinating. These days I can read some of the secretes that the earth gives up with a little work.
Date published: 2019-12-29
Rated 5 out of 5 by from A solid overview I found this course to be a very informative survey of geology. I found Dr.Renton's style to be friendly with well timed humor. It was exceedingly helpful to have all the slides and photographs to reinforce the concepts and theories.
Date published: 2019-12-19
Rated 2 out of 5 by from Outdated This lecture, while interesting, is completely outdated. This was produced before planets outside our solar system were discovered, and Pluto was downgraded from a planet. You can also tell by the decor, filming technology, and things said by the professor that this is old. Science changes as discoveries are made, and these lectures need to be kept up to date. There should be transparency on how old each course is, so you can factor that into your decision to purchase it. Overall I'm disappointed.
Date published: 2019-09-30
Rated 4 out of 5 by from Very Interesting and Informative I bought this about a month ago and haven't had time to get through more than the first four lessons, but has been very interesting and informative up to this point. I'm looking forward to continuing with the course.
Date published: 2019-09-19
Rated 5 out of 5 by from Trip to Iceland more understandable Our children, one a geologist, went to Iceland recently. While I have only completed 4 lessons, this course helped immensely toward understanding the forces at work here and at home in Wyoming. Now I understand E=mc2.
Date published: 2019-06-14
Rated 5 out of 5 by from great lectures for an outdoor person This course has greatly increased my understanding and appreciation for the great outdoors.
Date published: 2019-06-12
Rated 5 out of 5 by from Nature of Earth intro to Geology This is the best description and explanation I’ve ever heard and it is inspirational to the point of being life-changing. I’m going to get it for my girlfriend to watch with her geology-student-daughter so they can share this great course too. My husband and I haven’t finished but it’s fantastic so far!
Date published: 2019-05-18
Rated 5 out of 5 by from Nature of Earth: An Introduction to Geology I took this course as a subscriber of The Great Courses Plus and found it so informative and interesting that I bought the DVD. The instructor does an excellent job of acquainting the listener of geological facts in a completely understandable fashion and also relates how geological changes continue to impact today's world.
Date published: 2019-05-14
Rated 5 out of 5 by from Earth Those who are interested in in planet earth and climate change must see these lectures.
Date published: 2019-04-04
Rated 4 out of 5 by from I’ve watched all the lectures in this course and learned quite a lot about geology.
Date published: 2019-03-19
Rated 1 out of 5 by from LOUSY Lecturer! Aside from the obvious inaccuracies proffered by this professor, his lecturing style is UNBEARABLE. What initially impressed me as a quaint and folksy style - suitable to introductory material which was being presented quickly and without excessive detail - turned out to be the same style he uses when he gets into the “meat” of the course. When he runs out of information with which he’s familar, he just quits and moves on - - whether he has adequately covered the topic at hand or not. It finally dawned on me - at about lecture 8 or 9 - that he either was very poorly prepared for the lecture or wasn’t familiar with a great deal of the material being presented. A high school text on Geology would be a better souce of information for anyone interested in the topic! Also - the overall presentation of this course was done “on the cheap”. There were very few supporting slides or other material and what there were were crude and unfinished.
Date published: 2019-02-19
Rated 5 out of 5 by from Superb geology lectures Absolutely superb. I had taken geology in college, but these lectures tie things together in ways I had not previously known. Absolutely great. I am a retired MD, 63 yrs old, and feel like I am learning again like a college freshman. Very exciting to watch these lectures.
Date published: 2018-09-03
Rated 5 out of 5 by from Excellent Excellent content so far. Have watched some lectures several times to really grasp the information. Eager to continue.
Date published: 2018-08-07
Rated 5 out of 5 by from Cohesive lecture Organized and detailed lecturre allows me to build knowledge as I listen and watch related and descriptive images.
Date published: 2018-07-24
Rated 5 out of 5 by from Fascinating material, riveting lecturer Had always wanted to understand the basics of geology and this course has fulfilled it magnificently. It covers a wide range of natural, earth-science phenomena in an accessible and engrossing way, bringing in aspects of things I had never thought about--like the fact that water aquifers are NOT renewable. Prof Renton has the ease of delivery and style of presentation as that of an uncle sitting on the front porch filling in details and info about what out there in the vista is made of, how it got there and where else it's found. HIGHLY recommended. I am in the midst of Prof Wysession's 36 Geological Wonders course, which is also excellent and which this basic course supplements and enriches.
Date published: 2018-07-21
Rated 5 out of 5 by from Excellent coverage of Geology. Professor Renton gives a great course, giving sufficient details of the trees while giving appreciation of the entire forest.
Date published: 2018-06-29
Rated 4 out of 5 by from Pleasant and amiable instructor. I have only finished about half of this. It's good...but I get lost and have to go back to re-learn stuff I thought I had understood the first time. But that's no problem. I did the same in the DVD series about evolution of human language, which by the end I understood really well and found absolutely fascinating. One semi-critique: not this DVD series on geology necessarily but in others, it would be nice to have a recap ten or fifteen years later since these are becoming was done in later release of 'Cosmos.' For instance, have they learned anything new since the course was taught? I expect to find such outdated things in the other series I have recently bought on evolution which have become outdated since production.
Date published: 2018-06-02
Rated 1 out of 5 by from One of the worst courses here My husband and I could not finish the first lecture since it is full of errors. I will return this course. We hope that the teaching company have courses checked by people in the same field before release them.
Date published: 2018-04-25
Rated 5 out of 5 by from Far exceeded my expectations! I bought this when I retired to pursue a subject I always wanted to tackle. Dr Renton put all aspects into clear and precise terms I understood. I couldn't get enough of it so I went through it twice. Thanks so much- loved every minute of this course.
Date published: 2018-04-02
Rated 3 out of 5 by from Informative and on track - mostly I enjoyed the lecturer's style of conversation and what he had to say for the most part; however, he provided no demonstrations and his graphics/animation were bare bones. If he had simply skipped the final two lectures this would have been a superb course for someone with no or just a basic understanding of geology. He lost a lot of credibility with me though at the end where he went on a two-lecture rant about fossil fuel consumption. While he's generally right about how we should treat non-renewable energy resources, one of his solutions was to convert to natural gas! On top of that, he endorsed the use of corn and sugar-derived ethanol which have had mixed economic and environmental results. He praised Brazil for abandoning gasoline altogether by their use of sugarcane ethanol, but completely ignores or forgets that one of his first lectures was damning the South American governments that have been cutting down their rain forests for agriculture which he claims the soil is unsuitable for! I can't figure out any way to reconcile these concepts and it really drags down what was otherwise a good course.
Date published: 2018-02-09
Rated 5 out of 5 by from I was always fascinated by the amazing geological features of our world, but as a busy professional in a different field never had a chance to learn more about it than few basics. All I wanted was to admire our home planet and this course met all my needs and actually exceeded expectations. Although my 9 year old daughter thinks the professor is very boring, but for me he is one of the greatest teachers I ever had. He keeps the subject alive and I developed a special respect for him. So happy to have it and totally worth my time. I am amazed how little I knew and how much I now know in a very short period of time, all from the luxury of my couch, bed, & even driver seat when waiting to pick kids!
Date published: 2018-02-02
Rated 4 out of 5 by from Skip the first two lectures First the negative. The geologist should stick to geology. If he wants to lecture on cosmology he should take a few courses on cosmology. Cosmic dust is not dark matter. We can see cosmic dust. By 2006, the date of the course the existence of planets outside our solar system was well established. In short a great deal of what he says about the formation of the universe and solar system is just plain wrong. So,skip past the first two lectures. After that the course covers a wide range of topics that amazed me. His grasp of chemistry as it relates to geology was very impressive. The scope of geology surprised me and opened my eyes to the workings of the titanic forces that shaped and continues to shape the Earth.
Date published: 2018-01-26
Rated 1 out of 5 by from First 2 lectures full of Gross errors I have bought many Great Courses over the years, and by and large I have enjoyed them greatly. However, I just started watching "The Nature of Earth" . I couldn't complete watching the first 2 lectures as they were so full of ERRORS that it was embarrassing to watch this "expert" blunder on and on. If Renton knows so little about Cosmology, or the Formation of the Solar System, then he should have someone else talk about these topics. Even though he is a geologist and not a physicist, it is hard to imagine how a scientist in any field should know so little about basic physics. Example: Gravity is NOT a result of stuff rotating. (Even High school students should know that). But even when it comes to talking about the Earth (his subject: geology) he should know that the reason the night side of the Earth does not plunge to -100 or colder is NOT because of heat conduction through the atmosphere from the Day side to the Night side. Air is a slow conductor of heat. He should know that. Or does he think that winds of 1000's of mph transport heat from the day side to the night side.
Date published: 2018-01-19
Rated 4 out of 5 by from Nature of earth This professor is very engaging, a good speaker and made his points very clear. I'm really enjoying this lecture!
Date published: 2017-12-11
Rated 4 out of 5 by from A Good Geology Course A good geology course. However, the two lectures on the origin of the universe and on the protoplanetary formation of the solar system leave something to be desired. The instructor made a number of obvious (at least to me) technical factual errors. In one case for example, the lecturer mentions that galaxies rotate about their axes, but then adds, each is rotating some point in space, implying that there are two independent rotations taking place. That is typically not the case; they rotate on their axes and appear to be receding, in general, from other distant galaxies in accordance with Hubble's Law. Some galaxies may orbit others (such as the Large and Small Magellanic clouds do, dwarf galaxies that orbit the Milky Way), but they do not in general rotate about two seperate points in space. The instructor also mentions that stars are balls of fire, a common misconception, but in fact, they are not--stars are too hot for fire to occur and there is not enough oxygen in most stars to sustain a star's heat even if fire were possible. Stars are hot balls of fusion reactions; fires are a result of rapid oxidation, the fast combining of oxygen with another substance in a process called combustion. Fusion on the other hand, is the joining (a fusing) of one atom to another, releasing energy. Prof. Renton also mentions that dark matter is cosmic dust. It is not, dark matter is a hypothesized exotic substance that accounts for the overwhelming majority of the mass of the universe, but it is certainly not cosmic dust. I hasten to add, while it is true that cosmic dust is dark in that it is not usually self-luminous or reflective, Dark Matter in astronomy is a techincal term that refers to the afore mentioned hypothesized material. There are other clearly false statements in the astronomy section of first two lectures; but this is a geology course, not one on astronomy, and the instructor is a geologist, not a cosmologist or astronomer. The errors are largely esoteric in the context of geology and do not play a significant role in rest of the course, but if you have a background in astronomy, you might find this noticeably off-putting. Once the student reaches the section on continental drift (lecture 3), the course really takes off. The instructor has a dynamic and interesting presentation. From that point on, I give the course high marks; I only cut it down by one star in the rating due to the errors in the first two lectures.
Date published: 2017-10-09
Rated 5 out of 5 by from Enjoyed The Class, and the Professor! I found a lot to love in this class. It certainly was far more informative than my high school geology / earth science courses, and while I never found time for a similar class in college, I suspect this would be a level 200 course. It is pitched at people who desire learn about the basics, but he goes into enough depth to ensure he has covered the subject. Some things you might need to know: the Prof is a folksy kind of guy - if that bothers you, don't buy this. Also, this program is likely 10 or 20 years old. If you only like 'new' and 'jazzy' then don't buy this. Considering the age of the subject of the course, I can't see that 10 to 20 years really matters in a basic geology presentation. (I also never considered that knowledge needs a 'use by' date!) I found the subject and the professor engaging, his presentation thorough, and the course overall quite stimulating. I would love to see a follow up class and would be very happy if it were taught by the same professor! Thank you for a great class! I learned a lot!
Date published: 2017-09-21
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