1. Hotspots

2. Hot Spot Volcanoes
Relatively fixed areas where extremely hot areas in the mantle melt through the crust and produce volcanoes.

3. Unlike the volcanoes formed at plate boundaries these hot spot volcanoes often happen in the middle of oceanic or continental crust.

4. Yellowstone National Park sits on top of another hot spot.

5. As the plate slides over the hotspot, the old volcanoes move away from the hotspot and erode. At the hotspot, a new volcano forms. By using the age of the volcanoes, we can then determine direction and speed of the plate.