Recap divergent and convergent boundaries with a video on plate tectonics. After discussing the circumstances surrounding subduction at oceanic and continental plates versus subduction at two oceanic boundaries, the video explains the...

Need a video to accompany your lecture on plate tectonics? Sal summarizes clues that certain parts of the world may have once been connected. Use the video as part of one lecture or break it up over several lessons.

Explore the tectonic plates that make up the surface of our Earth and their movement, as well as the terminology of the Earth's structure.

Sal explains the formation of Hawaii and the theories behind the formation of a boundary-related hot spot. He debates the concept that the hot spot is traveling along with the plate.

There are few natural phenomena as startling as an earthquake, and depending on the building you're in, these experiences can be downright terrifying. Follow along as this video explores the factors that determine how a building...

Sal explains the mechanism of crust lift developing at hot spots. The density changes at that point, continuing to cause depressions. The depressions and thinner layers fill with water, resulting in a flooded rift valley.

Sal details the chemical and mechanical composition of the Earth's crust, mantle, and core layers—a substantial addition to your geology or earth science lecture.