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The Appalachian Mountains were formed about 500-400 million years ago. What has caused them to change so much over time

User Pawan
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Answer:

There are many factors that go into the changes made to the Appalachian Mts.; you've got wind erosion, water erosion from rain/snow melting, and tectonic plate movements that can either cause the mountains to grow or to shrink.

User Kcvin
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