Final answer:
The Theory of Plate Tectonics explains how and why the Earth's crust moves, due to the movement of tectonic plates.
Step-by-step explanation:
The Theory of Plate Tectonics describes that the Earth's crust moves. It explains how and why the Earth's crust moves due to the movement of tectonic plates. These plates interact at plate boundaries, leading to various geological phenomena such as earthquakes, volcanic eruptions, and the formation of mountain ranges.
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