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Sagot :
Answer:
Currently the continents and ocean basins all float on the mantle, the layer beneath the crust, which flows like putty. Deep parts of the mantle heat up, and rise, and as they do they cool down, sinking again, creating huge circular currents. The currents push and pull the tectonic plates across Earth's surface.
Explanation:
Answer:
Over millions of years, ocean basins open and close, continents move and change shape, and mountains are pushed up and eroded away. Such dynamic processes continually reshape the surface of the Earth. The movement of rigid plates on the Earth's surface, known as plate tectonics, is the cause of these changes.
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