One source of the energy for volcanism and plate tectonics is radioactivity in the Earth's interior.

Name: One source of the energy for volcanism and plate tectonics is radioactivity in the Earth's interior.
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Radioactive decay of elements such as uranium, thorium, and potassium in the Earth's mantle generates heat, which contributes to the convection currents that drive plate tectonics and volcanic activity.

One Source of the Energy for Volcanism and Plate Tectonics