Animations illustrate volcanic processes and how plate boundaries are related to volcanism. This magma seeps into crevices in existing rock to form intrusive igneous rocks.

The program also surveys the various types of eruptions, craters, cones and vents, lava domes, magma, and volcanic rock. Experts provide a graphic illustration of this process and explain the types and textures of rocks such as granite, obsidian, and quartz.

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The program provides images of glaciers and glacial landforms such as moraines, and discusses how study of glaciers may help us understand ice ages and the greenhouse effect. Waves, Beaches and Coasts This program shows the dynamic interaction of two geologic agents: rocky landmasses and the energy of the ocean.

Aspects of waves — their types, parts, movement, and impact on the shore — are illustrated.

This program looks at the variety of minerals, their atomic and crystalline structures, and their physical properties such as hardness and luster.

Petrologists' methods of sectioning rocks are shown, and gems, precious metals, ore excavation, and the value of silicates are discussed. Volcanism Volcanoes provide clues about what is going on inside Earth. Intrusive Igneous Rocks Most magma does not extrude onto Earth's surface but cools slowly deep inside Earth.

The program also covers shoreline characteristics, currents, sea barriers, tides, and how the greenhouse effect could impact sea level and coastal lands. Living With Earth, Part I Scenes of San Francisco before the Loma Prieta earthquake introduce this program addressing how humans are learning to cope with earthquakes. Living With Earth, Part II Since the nineteenth century, humans have turned to the Earth for energy sources to fuel their industry.

Various groups and agencies are studying the San Andreas Fault and the damage caused along its path to better understand how earthquakes ravage the land. This program discusses where oil comes from, how it is extracted, and how it is converted into energy.

This series shows the physical processes and human activities that shape our planet.

From earthquakes and volcanoes to the creation of sea-floor crusts and shifting river courses, Earth Revealed offers stunning visuals that explain plate tectonics and other geologic concepts and principles.

This program traces the development of plate tectonics, beginning with the contributions and methods of geologist Alfred Wegener.

Sea-floor spreading, continental drift, paleomagnetism, and the primordial supercontinent Pangaea are some of the topics covered. Plate Dynamics This program examines the movement and interaction of tectonic plates, which account for a vast array of geologic formations and phenomena — from California's San Andreas Fault to the Rift Valley of eastern Africa.

Once again, plate tectonics is shown to be involved in the process. Weathering and Soils The Cleopatra's Needle obelisk in New York City's Central Park is severely weathered after only 75 years, whereas the dry climate of Egypt has preserved similar structures in that country for millennia. Mass Wasting Anyone undertaking a building project must understand mass wasting — the downslope movement of earth under the influence of gravity.