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USGS CMG InfoBank: Earth's Structures

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Comment: 00:40 - 01:29 (00:49)
Source: Annenberg/CPB Resources - Earth Revealed - 8. Earth's Structures
Keywords: "James Sadd", plate, deformation, tectonics

Our transcription: Dramatic landscapes like mountain ranges, mid-ocean ridges, and the Grand Canyon are created by extraordinary forces in the Earth's crust.
These forces generally arise from the movement of tectonic plates, and they not only shape the landscape, they also permanently deform the rocks of the crust.
The rocks either break or under certain circumstances actually flow like a very thick liquid.
When rocks are deformed in this way, geologic structures, such as faults and folds are produced.
Rock deformation is often accompanied by vertical motions of the Earth's crust, causing it either to rise or subside.

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Page Last Modified: Thu Oct 31 04:28:19 PDT 2013  (chd)