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Mantle convection is a circulation of heat emitted by the earths...
A) core
B) crust
C) lithosphere
D) atmosphere

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taskmasters
The correct answer is (a.) core. Mantle convection is a circulation of heat emitted by the earth's core. The Mantle convection is the creeping motion of the Earth's mantle that is causing the heat to transmit from the inferior portion of the core to the Earth's surface. 
juliannacopper

Although this lesson does not mention the answer in the text, it does imply an animation that implies the answer to be the Earth's core, with the fallowing text: "Like the boiling water example, a convection cell or circular flow occurs, as shown in the mantle convection animation above."

Answer: Core

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