Final answer:
The Theory of Plate Tectonics explains the how and why of the movement of Earth's plates.
Step-by-step explanation:
The correct answer is the Theory of Plate Tectonics. This theory explains how and why Earth's plates move. It states that the Earth's lithosphere is divided into several large, rigid plates that move slowly over the underlying mantle.
Plate movement is driven by convection currents in the mantle, which cause the plates to separate, collide, and slide past each other. These movements can result in earthquakes, volcanic activity, and the formation of mountain ranges.
Learn more about Plate Tectonics