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 c...
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.
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 toge...
Coasts Are Arbitrary
Geophysicist and geologist Tanya Atwater notes that the line between oceans and continents, commonly known as the coast, is actually very arbitrary and subject to change over time. She also talks about implications of global warming for coastal regi...
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.
Differences Between Oceans and Continents (Part 1)
Geophysicist and geologist Tanya Atwater talks about the very different ways in which oceans and continents are formed and how each changes over time.