what are tectonic plates ?
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Tectonic plates are pieces of Earth's crust and uppermost mantle, together referred to as the lithosphere. These are (also called lithospheric plates) massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
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Plate tectonics is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth's lithosphere, since tectonic processes began on Earth between 3.3 and 3.5 billion years ago.
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