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5. What process does the Earth's internal heat come from?
A. the heat comes from the decay of substances in the core and the convection in the
mantle.
B. the heat comes from the decay of substance in the core and the convection in the crust
C. the heat comes from the convection in the mantle and conduction in the crust.
D. the heat comes from convection in the mantle and conduction in the core.