Learn about the development of life on earth over the past 540 million years.

Depicts a volcano in cross-section and offers a step-by-step simulation of an eruption.

See videos illustrating the space agency's studies of the Earth, its biosystems and its atmosphere. Link to further details on its projects.

Download a free program for simulating the different kinds of volcanic eruptions. View screenshots of sample cataclysms.

Explore this sixty-mile cave in Belize by looking at photos and 360-degree views of rock formations.

USGS presents these images of ocean and lake floors. Download QuickTime visualizations of Crater Lake, Lake Tahoe and the coast off Los Angeles.

Move any of the four tectonic plates to start an earthquake, make land masses collide, spread the seas, or initiate your own continental drift.

See GIF, QuickTime and AVI depictions of tectonic movements over the last 750 million years.

Travel through planet Earth's layers and see what factors influence the formation of a new crust.

Useful resource derived from the PBS TV show. Check out the animations and read articles on quake prediction, tsunamis and the Earth's crust.

Find animated maps displaying urban growth in the cities of Baltimore and San Francisco during the last several centuries.