The Appalachian Mountains formed when the North American Plate and another plate collided millions of years ago. Which geologic processes primarily contributed to forming the Appalachian Mountains?

When tectonic plates collide, rocks are compressed, folded, and pushed upward. These processes—folding and uplift—primarily formed the Appalachian Mountains. Seafloor spreading and plate divergence happen where plates move apart, so they do not best describe the mountain-building collision.

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