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- tectonic processes
- Earth's moving plates
- converging
plates - Cascades, Sierra Nevada
- diverging -
Red Sea and African Rift Valley
- gradational process
- widdling down mountains and canyons
- Eastern U.S.
and Appalacian Mtns.,
- Grand Canyon
- both uplift and cutting down
- depositional process,
filling in valleys and lowlands, seas
- Mississippi
Valley
- California
Central Valley
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