03:05
Something in the Air: Atmospheric Circulation Patterns
While Hadley cells are generally considered to be the most basic of atmospheric cells, there are a number of other air circulation patterns, as well. These include the east-to-west moving Walker cells, and the circulation zone located near the equat...
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.
05:54
World in Motion: Heat, Convection and Plate Tectonics
Most scientists believe heat and convection probably play a major role in plate tectonics. And, yet, many questions remain.