![]() ![]() Of course, the internal forces are still active though with different intensities. The earth's surface is being continuously subjected to external forces induced basically by energy (sunlight). The differences in the internal forces operating from within the earth which built up the crust have been responsible for the variations in the outer surface of the crust. Of course, it moved a bit faster in the past than the rate at which it is moving now. ![]() You are well aware that it has moved and moves vertically and horizontally. Why is the surface of the earth uneven? First of all, the earth's crust is dynamic. A fter learning about how the earth was born, how it evolved its crust and other inner layers, how its crustal plates moved and are moving, and other information on earthquakes, the forms of volcanism and about the rocks and minerals the crust is composed of, it is time to know in detail about the surface of the earth on which we live. ![]()
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