What Causes Convection Currents in Earth's Mantle?

Answer

The activity of very hot material that exists at the deepest part of the mantle is responsible for convection currents. The hot material is composed of molten rock and trapped gases
Q&A Related to "What Causes Convection Currents in Earth's Mantle..."
the cycle of heating, cooling, rising, and sinnking
http://wiki.answers.com/Q/What+is+convection+curre...
The higher heat surrounding the core verses it being cooler in the mantle.
http://answers.yahoo.com/question/index?qid=200910...
Convection currents in the mantle are caused by heat from the interior
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The sun drives convection in the atmosphere and, to a lesser extent, in the oceans. Heated air rises in convection currents from the Earth's surface in columns called "thermals
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