What are plate tectonics???

Plate tectonics is a scientific theory which says that earths lithosphere is composed of distinct tectonic plates, these plates are in motion and have resulted in the drift of continents away from each other and formation of some mountains like Himalayas.  

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  A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest. Plate thickness also varies greatly, ranging from less than 15 km for young oceanic lithosphere to about 200 km or more for ancient continental lithosphere (for example, the interior parts of North and South America).

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