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..."
Earths outer core.
http://wiki.answers.com/Q/What_causes_convection_c...
The mantle is made up of molten rock and trapped gases. All of this matter is under pressure because of Earth's gravitational pull, according to Don Anderson of the California Institute
http://www.ehow.com/list_6581412_causes-convection...
Since this material is hottest near the core, it rises, cools near the surface and sinks.
http://answers.yahoo.com/question/index?qid=201011...
Collision zone is a destructive
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