= Plate tectonics
{wiki=Plate_tectonics}
Plate tectonics is a scientific theory that explains the large-scale movement of Earth's lithosphere, which is divided into several tectonic plates. These plates float on the semi-fluid asthenosphere beneath them, and their interactions shape the Earth's surface, leading to various geological phenomena. Key concepts of plate tectonics include: 1. **Lithosphere and Asthenosphere**: The lithosphere is the rigid outer layer of the Earth, comprising the crust and the uppermost mantle.
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