The asthenosphere is a semi-fluid layer of the Earth's mantle located just below the lithosphere, which is crucial for plate tectonics and geologic processes. This region extends from about 100 to 700 kilometers beneath the Earth's surface and plays a key role in the movement of tectonic plates as it allows them to glide over this softer, more ductile layer. The asthenosphere's properties facilitate convection currents that drive plate movements and contribute to various geological phenomena such as earthquakes and volcanic activity.
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