Explores the nature and consequences of earthquakes, the factors that cause quakes, their location, and characteristics. Portrays the immensity of the geologic time scale, which is the world-wide basis for correlation of geologic events, rock formation, and fossils. Unveils the rock-forming processes of magmas that do not reach Earth's surface but solidify underground. Interprets the causative factors of metamorphism and the kinds of rocks produced. Recognizes the roles human activity can play in intensifying or reducing flood danger, and describes the process by which streams and valleys are shaped and landscapes formed.
Deserts cover a third of all land masses and are located in polar as well as equatorial regions.
This program shows how they form and their major features. Responsible for such spectacular scenery as the Alps and Yosemite Valley, glaciers are important sculptors of Earth's surface. Expresses human responses to the destructive forces of natural phenomena, such as earthquakes and landslides. Explores the impact of human activity on Earth and discusses ways in which people can shape their actions to benefit Earth.