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Hotspot (geology)

In geology, a hotspot is a location on the Earth's surface that has experienced active volcanism for a long period of time.

Hotspots were thought to be caused by a narrow stream of hot mantle convecting up from the mantle-core boundary called a mantle plume, the latest geological evidence is pointing to upper-mantle convection as a cause.

This in turn has re-raised the antipodal pair impact hypothesis, the idea that pairs of opposite hot spots may result from the impact of a large meteor.

Geologists have identified some 40-50 such hotspots around the globe, with Hawaii, Reunion, Yellowstone, Galapagos, and Iceland overlying the most currently active.

Note:   The above text is excerpted from the Wikipedia article "Hotspot (geology)", which has been released under the GNU Free Documentation License.
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November 29, 2015

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