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Name: John S.
Status: Other
Age: 40s
Location: N/A
Country: N/A
Date: October 13, 2003


Question:
Where does the heat come from in a volcano?



Replies:
That depends in part on the type of volcano and where it is located. Hawaiian volcanoes are believed to be a result of "hot spot volcanism," where heat wells up from the Earth's interior. These volcanoes usually occur in the middle of a plate, and it is almost as if the Earth just has to vent the heat. Other volcanoes, like the Andean and Cascade volcanoes, occur along plate margins where an oceanic plate subducts, or slides under, a continental plate. Here, the rock subducts to a depth where pressure causes the rock to melt, and that melted rock rises toward the surface, perhaps resulting in an eruption and a volcano.

Pat Rowe



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