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  • Diastrophism refers to deformation of the Earth's crust, and more especially to folding and faulting. Diastrophism can be considered part of geotectonics. Diastrophism comes from the Greek word meaning a twisting. All processes that move, elevate or build up portions of the earth’s crust come under diastrophism. They include: orogenic processes involving mountain building through severe folding and affecting long and narrow belts of the earth’s crust; epeirogenic processes involving uplift or warping of large parts of the earth’s crust; earthquakes involving local relatively minor movements; plate tectonics involving horizontal movements of crustal plates. Diastrophism covers movement of solid crust material, as opposed to movement of molten material which is covered by volcanism. Movement causes rock to be bent or broken. The most obvious evidence of disastrophic movement can be seen where sedimentary rocks have been bent, broken or tilted. Such non-horizontal strata provide visual proof of movement. Diastrophic movement can be classified as two types, folding and faulting, tilted beds usually are part of a larger syncline or anticline.