|Plate Tectonics: Further Evidence|
Early evidence showing striking similarities between regions on opposite sides of vast oceans suggested that in Earth's distant past what are now separate continents may once have been connected. However, this evidence said nothing about how the continents could have moved to their present positions. This video shows how seafloor spreading creates new oceanic crust and how the crust is destroyed by subduction into Earth's mantle, providing the mechanism and forces that propel tectonic plates across Earth's surface. The segment is two minutes nine seconds in length.
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Source: A Science Odyssey: Short Trips "I Feel the Earth Move". Copyright 2002-2006, WGBH Educational Foundation. All rights reserved.
DLESE Catalog ID: DLESE-000-000-009-733
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Publisher: WGBH Educational Foundation