geography

what is a circulating current of magma


It is boiling hot melted rock, moving about in some circular flow.

Apparently there are places underground where magma (molten basalt above 1000 C) circulates in a flow loop, up and down, without reaching the surface. One such place is below a volcano in Nicaragua. There may be others below Flagstaff, AZ, Yellowstone, Hawaii, and the active and dormant Cascade volcanoes of the western US (Lassen; St. Helens; Baker). There is interest in exploring these regions for geothermal energy.

recommended reading:
http://www.osti.gov/bridge/servlets/purl/5205879-LM85Nb/native/5205879.pdf

i have heard that there is exactly 5 in Flagstaff, AZ

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