Here's why:

* Appalachian Mountains: The Appalachians are a range of folded mountains. This means they were formed by the collision of tectonic plates, causing the Earth's crust to buckle and fold.

* Upwarped Mountains: Upwarped mountains are formed by a slow, vertical uplift of the Earth's crust. They typically have a dome-like shape.

Examples of Upwarped Mountains:

* The Black Hills in South Dakota

* The Adirondack Mountains in New York

Examples of Folded Mountains:

* The Appalachian Mountains

* The Rocky Mountains

* The Himalayas