Plate theory, often referred to as plate tectonics, is a scientific theory that explains the structure and movement of the Earth's lithosphere, which is the rigid outer layer of the Earth. This theory describes how the lithosphere is divided into several large and small plates that float on the semi-fluid asthenosphere beneath them. These tectonic plates are constantly moving, and their interactions at plate boundaries can lead to various geological phenomena, including earthquakes, volcanic activity, and the formation of mountain ranges.
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