![]() ![]() The whole mechanism of the evolution, nature and motion and resultant reactions of plates is called ‘plate tectonics’. The term ‘plate’ was first used by Canadian geologist J.T. The rigid lithospheric slabs or rigid and solid land masses having a thickness of about 100km composed of earth’s curst and some portion of upper mantle are technically called ‘plates’. Plate movements take place in accordance with the Euler’s geometrical theorum which envisages the movement of plates in the form of simple rotation along a pole of rotation (see fig. The plates move in different directions relative to each other under the impact of thermal convective currents. Thermal convective currents originating in the mantle have been accepted as the competent force for the movement of plates. The orogenetic force to form mountains is provided by the compressive forces caused by the collision of two convergent plates along the destructive plate boundaries.
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