02:10
The Ocean's Memory: Terrigenous Sediments
Sediment is the debris that accumulates on the surface of the Earth as the result of chemical, physical and biological processes. Most sediment, known as terrigenous sediment, forms when rain falls on soil and washes it into rivers, which then carry...
02:49
World in Motion: Earth's Tectonic Past and Future
Scientists attempt to reconstruct Earth's history so as to better understand the current state of geologic affairs, including those forces that cause plate movement.
06:32
World in Motion: Plate Boundaries and Plate Movement
Whether studying earthquakes, volcanoes, or other geologic events, scientists usually focus their attention on plate boundaries and plate movement.