02:37
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.
06:09
Making the Pieces Fit: Alfred Wegener and Continental Drift
Alfred Wegener proposed the idea of continental drift to explain the jigsaw puzzle fit of the continents. Wegner argued that the continents had all been joined together at one time as a super continent he called Pangaea. Wegener's ideas were initial...