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Earth (Planet) — Mantle
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1.

Isostasy

Geophysicist and geologist Tanya Atwater discusses isostasy, which allows objects at the surface of Earth to float in equilibrium, and talks about how it helps define Earth's topography.
Online
2015; 2011
2.

Early Evidence of Continental Drift

Geophysicist and geologist Tanya Atwater points to the jig-saw puzzle fit of Africa and South America as the most obvious evidence supporting the theory of continental drift.
Online
2015; 2011
3.

Differences Between Oceans and Continents (Part 2)

Geophysicist and geologist Tanya Atwater compares the relatively neat sea floor with continents, which she terms a "mess." She attributes these differences to the predictable and "tidy" process of seafloor spreading, as compared to the crashing together of continental structures.
Online
2015; 2011
4.

Seafloor Spreading: Vine and Matthews

Geophysicist and geologist Tanya Atwater talks about work done by Fred Vine and Drummond Matthews that ultimately provided proof of seafloor spreading by tracking the patterns of magnetic striping on the ocean floor.
Online
2015; 2011
5.

Wegener's Mistakes

Geophysicist and geologist Tanya Atwater talks about mistakes made by Alfred Wegener in formulating his theory of continental drift, some of which created doubt and skepticism among fellow geologists.
Online
2015; 2011
6.

Seafloor Spreading and Plate Tectonics (Part One)

Geophysicist and geologist Tanya Atwater talks about the role of seafloor spreading and spreading centers in the plate tectonics process.
Online
2015; 2011
7.

Post-World War II Oceanography

Geophysicist and geologist Tanya Atwater talks about technology developed as part of the war effort in the 1940's that would prove critical in the formulation of plate tectonics theory.
Online
2015; 2011
8.

Taking Core Samples: Module 4

Professor Trujillo demonstrates the process of rotary drilling to take core samples of the ocean floor.
Online
2018; 2010
9.

Seafloor Spreading: Harry Hess

Geophysicist and geologist Tanya Atwater talks about seafloor spreading, an idea first articulated by Harry Hess that many consider to be the linchpin of plate tectonics.
Online
2015; 2011
10.

Differences Between Oceans and Continents (Part One)

Geophysicist and geologist Tanya Atwater talks about the very different ways in which oceans and continents are formed and how each changes over time.
Online
2015; 2011
11.

Seafloor Spreading and Plate Tectonics (Part 2)

Geophysicist and geologist Tanya Atwater talks about the Deep Sea Drilling Project and the confirmation of magnetic reversals that provided strong evidence of seafloor spreading and plate tectonics.
Online
2015; 2011
12.

Alfred Wegener and Continental Drift

Geophysicist and geologist Tanya Atwater discusses the role of Alfred Wegener in bringing together a variety of evidence in support of the theory of continental drift.
Online
2015; 2011
13.

Pangaea

Geophysicist and geologist Tanya Atwater talks about the super continent Pangaea, thought to have broken up into the continents as we know them today beginning about 200 million years ago.
Online
2015; 2011
14.

Asthenosphere: Module 2, Part 1

Professor Trujillo demonstrates the properties of the Asthenosphere layer of the Earth's crust.
Online
2018; 2010
15.

Asthenosphere: Module 2, Part 2

Professor Trujillo demonstrates the properties of the Asthenosphere layer of the Earth's crust.
Online
2018; 2010
16.

Plate Tectonics and Earthquake Distribution

Geophysicist and geologist Tanya Atwater talks about the correlation between plate boundaries and earthquake distribution.
Online
2015; 2011
17.

Oceanic Crust vs. Continental Crust

Geophysicist and geologist Tanya Atwater discusses the differences between continental and oceanic crust. Continental crust tends to be much thicker and would be thicker still were it not for the forces of gravity and erosion. In addition, oceanic crust forms as a result of seafloor spreading, while continental crust is made at subduction zones from the same melting material that rises to make volcanoes.
Online
2015; 2011
18.

Plate Tectonics and Heat

Geophysicist and geologist Tanya Atwater talks about plate tectonics as a mechanism by which Earth's interior sheds the tremendous heat that builds up as a result of radioactive decay.
Online
2015; 2011
19.

Gems

Their beauty has captivated us for millennia. Their cost can be extraordinary-some are even considered priceless. Precious gems like diamonds, rubies, emeralds, opal, and jade are the ultimate treasures of the earth, and each one is made from a specific-and often torturous-recipe of chemistry, pressure, and heat.
Online
2018; 2016
20.

Mountains, Volcanoes, and Earthquakes

Sometimes Earth can be more sensational than a tabloid magazine. It's full of drama, drama, drama. This video documents some of the more wild times on the planet and what it's all got to do with plate tectonics. It might even contain some revealing photographs. Topics include: Plate Tectonics, Mountain-Building, Volcanoes, and Earthquakes.
Online
2018; 2013