Here's why:

* Hot Spot: A hot spot is a location where magma from deep within the Earth's mantle rises to the surface. This creates volcanoes and other geothermal features.

* Continental Setting: Yellowstone is located in the middle of the North American Plate, far from any plate boundaries. This means it's not due to plate collisions or rifting.

The Yellowstone hot spot has been active for millions of years, creating a chain of volcanoes that have migrated across the landscape as the North American Plate moved westward. Today, the hot spot is beneath Yellowstone National Park, causing the numerous geysers, hot springs, and volcanic features we see there.