Plate tectonics is the theory that the land masses on Earth are constantly moving. Alfred Wegener proposed the concept of continental drift, or the movement of Earth's land masses.
Plate tectonics theory revolutionized earth science by describing how the movement of geologic plates creates mountain formation, volcanoes, and earthquakes. Plate tectonics theory proposes that the Earth's outer shell (lithosphere) is split into many plates that glide over the rocky inner layer just above soft core (mantle). In comparison to the Earth's mantle, the plates act as a rigid and hard shell.
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