Question

what is theory of tectonic plates

Answer 1

Plate tectonics is the theory that the outer rigid layer of the earth (the lithosphere) is divided into a couple of dozen "plates" that move around across the earth's surface relative to each other, like slabs of ice on a lake.
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Answer 2

Hiii mate   Hope this helps you    The Theory of Plate Tectonics is a scientific theory describing the large-scale motion of Earth's outermost hard shell (lithosphere). An important concept in plate tectonic theory is continental drift which deals with Earth's continents movement in relation to each other.