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7. What are convection currents in the mantle caused by?
A. The core heats up magma and increases its density, so it rises.
B. The core heats up magma and decreases its density, so it rises.
C. The core cools down magma and increases its density, so it rises.
D. The core cools down magma and decreases its density, so it rises

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cjchang

Answer: b

Explanation:

Heat from the core and the mantle itself causes convection currents in the mantle. It’s getting hotter. When something gets hotter, it is less dense.

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