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If there were no thermal difference in the mantle what would happen to convection currents?

Answer and explanation

Correct answer: The possibility of convection currents would decrease

Convection is movement caused by differences in temperature and density. In the mantle, warmer material tends to become less dense and move upward, while cooler, denser material tends to move downward. This continuous contrast can help produce convection currents. If the mantle had no thermal difference, this driving force would be greatly reduced, so the formation or strength of convection currents would decrease.

Option A is therefore the best answer. Option B gives the opposite effect, because removing a thermal contrast would not immediately make convection faster. Options C and D are also too extreme: the ocean floor would not simply disappear, and earthquakes would not necessarily stop completely. The question asks specifically about convection currents, so the direct effect of losing the temperature difference is reduced convection.

Related tags

Thermal DifferenceConvection CurrentCause Effect

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