Respuesta :

Answer/Explanation:

Differences in temperature in the mantle cause convection currents. If it weren't for these convection currents wouldn't exist.

Answer:

Explanation:

The answer is A. temperature differences in the mantle.

Explanation: A change in temperature will change the mantle's density. The heavier mantle will drop down while the lighter mantle will float up; forming a convection flow.

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