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The four basic skin sensations are:
Volcanoes
Openings in the Earth's crust through which molten rock, ash, and gases are ejected.
Plate Tectonics
A scientific theory explaining the movement of the Earth's lithosphere, which is divided into tectonic plates, over the more fluid asthenosphere.
Asthenosphere
The highly viscous, mechanically weak, and ductilely-deforming region of the upper mantle of the Earth, which lies just below the lithosphere.
Plate Boundary
The region where two tectonic plates meet, which can be characterized by seismic activity, mountain building, and volcanic eruptions.
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