Friday, March 2, 2012
A hotspot is a concentration of heat in the mantle that produces magma that reaches the Earth's surface. These hotspots can produce intraplate volcanoes. Intraplate volcanoes are those that occur within a tectonic plate and NOT on the plate boundary. The Hawaiian Islands were formed when the Pacific plate moved over a hotspot. The bottom picture is of Mauna Loa volcano in Hawaii. The volcanoes of Hawaii are broad domed-shaped volcanoes known as shield volcanoes.
The top picture is of Old Faithful geyser in Yellowstone National Park. Much of Yellowstone National Park is in a caldera- a large depression in a volcano. Yellowstone is an active geologic feature that lies over another intraplate hotspot. There is much conjecture that the Yellowstone area is due to erupt sometime in the future.
Posted by Coach V