Why does convection cause movement of material and energy in earths interior

The Heat from the core and from the mantle itself drives convection currents. These currents carry hot, solid rock of the mantle outward and cooled, solid rock inward in a never-ending cycle.

Explanation:

As the oceanic lithosphere cools and sinks, it drives a pattern of mantle convection. The cold lithosphere moves down into the mantle, where it is heated. An upward return flow of hot rock completes the cycle, as shown in Figure 7. Over and over, the cycle of sinking and rising takes place. One full cycle takes millions of years. Convection currents are involved in the production of new rock at Earth’s surface. There are also convection currents in the outer core.

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explanation: