Exfoliation geology is a type of rock weathering where the rock's layers peel off in whole sheets instead of grain by grain. Large-scale exfoliation occurs due to the mechanics of gravity on a curved surface, while small... More »

Human skin replaces itself approximately once every 27 days, according to WebMD. The process of skin renewal occurs through exfoliation. More »

Some tips for having beautiful skin include using sunscreen during the day, gentle exfoliation and wearing sunglasses. Eating healthy foods also promotes healthy skin cells. More »

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Stratigraphic columns are illustrations made by geologists to represent the relative composition, thickness and scope of layers of rock, such as in a canyon, a volcano or a cliff. Some drawings are black and white with l... More »

According to the National Park Service, sedimentary rock forms when mud and sand are deposited into layers on the earth’s surface and later buried. The buried mud and sand is compacted by the weight of the overlying laye... More »

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A laccolith is a geological structure that forms when magma pushes through layers of rock above it and pools in a dome shape. Laccoliths are characterized by their shape, as they are typically flat on the bottom and roun... More »

The principle of superposition in geology states that rock forms horizontally, with the oldest layers of rock lying at the bottom of a formation and newer rock resting on top. For instance, the Kaibab Limestone at the ed... More »