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Earth Revealed
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41.

Running Water

The running water flowing from rivers and streams sculpts the surface of the earth. Deduce that rivers are extremely powerful and that though humankind may try, the ability to control rivers is limited.
Online
2015; 1999
42.

The Birth of a Theory

Trace the origins of the concepts of continental drift and sea-floor spreading and their contributions to the plate tectonics theory. Note how seemingly unrelated geological phenomena converge to create Earth's unique geological status.
Online
2015; 1999
43.

Earth's Interior

Gain an understanding of geophysical research by watching this video about the study of the interior of the earth.
Online
2015; 1999
44.

Metamorphic Rocks

The study of metamorphic rocks provides very valuable information about the temperatures and pressures that occur at great depths within the earth's crust. Watch this program to gain perspective on the metamorphic process studied by earth scientists.
Online
2015; 1999
45.

Intrusive Igneous Rocks

Unveil the rock-forming processes of magmas that do not reach Earth's surface but solidify below the earth's crust. Intrusive igneous rocks provide clues that enable scientists to learn more about the evolution of the earth.
Online
2015; 1999
46.

Minerals

Minerals are raw materials that occur naturally on the earth. Consider the fact that many geologists study minerals to learn about the earth and its history while humankind has endowed minerals with a fundamental role in the growth of civilizations.
Online
2015; 1999