Cell phones to crowdsource vibrations to warn of incoming earthquakes? Detectors to register high levels of radon-thoron isotopes? After detailing the factors that make earthquakes so difficult to predict, the narrator of a fascinating...

Take the mystery away from earthquakes. A video lesson explains the theory of plate tectonics and how it relates to earthquakes, volcanoes, mountains, and oceanic trenches. The instructor gives specific feedback on the progression of the...