- Earth's interior is heated by radioactive decay of elements such as uranium, thorium, and potassium.
- Under Earth's crust is a malleable layer of heated rock known as the asthenosphere
- The asthenosphere circulates as convection currents underneath the solid lithosphere.
Explanation:
The asthenosphere is the upper part of the mantle that has the property of semi-plasticity. It is the layer that has convention current responsible for tectonic plate movement. The lower regions of the layer are heated more by the heat from the core and become less dense. The layers from the bottom rise and the cooler upper layers sink to the bottom. This cycle continues just like any other convection currents in a fluid.
As these convection currents churn about, they drag the lithosphere above, at the lithosphere–asthenosphere boundary, by the force of drag.
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Answer:
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