Information AboutExfoliation (geology) |
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Exfoliation in geology is a Weathering process, mainly caused by Freeze-thaw Cycle s. In this process, hard rock like Granite forms several kilometers below the surface as magma slowly cools and crystallizes. The granite is under great pressure due to overlying rock. Then, granite is rapidly uplifted to the surface during a mountain-building event. During the Mountain Building Process , the overlying rock is stripped away by erosion as the granite is uplifted. With the overling rock removed, the pressure on the granite is reduced. The granite expands and Fracture s. These fractures, called sheet joints, develop parallel to the Earth's surface. The granite erodes in concentric layers (similar to the way an Onion peels) forming rounded masses called exfoliation domes. One famous exfoliation dome in the United States is Half Dome . ''See also:'' Spheroidal Weathering |
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