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DYNAMICS OF EARTH'S CRUST

the movement of internal surface of the crust with internal forces to form an elevation and mountain systems.

CAUSE OF EARTH MOVEMENTS

uplift - the surface move upward.


subsidence - sinking of the crust move downward.


thrust - moves horizontally

THEORY OF ISOSTACY

Greek word meaning "equal standing" or state of balance.

holds the surface in balance

CONTRACTION THEORY

the earth is gradually shrinking because of its cooling.

CONVECTION THEORY

the liquid get heated and rise.