Question

Define tectonic or lithospheric plates.

Answer 1

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Plate tectonics (from the Late Latintectonicus, from the Greek: τεκτονικός"pertaining to building")[1] is a scientific theorydescribing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth's lithosphere, over the last hundreds of millions of years. The model builds on the concept of continental drift, an idea developed during the first decades of the 20th century. The geoscientific community accepted plate-tectonic theory after seafloor spreading was validated in the late 1950s and early 1960s.

The lithosphere, which is the rigid outermost shell of a planet (the crust and upper mantle), is broken into tectonic plates. The Earth's lithosphere is composed of seven or eight major plates (depending on how they are defined) and many minor plates. Where the plates meet, their relative motion determines the type of boundary: convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trenchformation occur along these plate boundaries (or faults). The relative movement of the plates typically ranges from zero to 100 mm annually.[2]


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Answer 2

(in geology) the movements of the large sheets of rock (plates) that form the earth’s surface; the scientific study of these movements.