This video segment from IdahoPTV's D4K describes the forces of earthquakes, volcanoes, water, and glaciers that shape the surface of the earth. You see a fault line, Craters of the Moon lava fields, and examples of Idaho's batholith. Find out about tectonic plates and how they move. Discover the age and structure of the earth.
Visit the D4K companion Web site to learn more about Geology: D4K: “Geology”