Answer
An exfoliation dome forms through a process known as exfoliation, which is a type of mechanical weathering. It occurs in regions with large daily temperature fluctuations, such as deserts or mountainous areas.
During the day, rocks are exposed to high temperatures, causing them to expand. At night, the temperatures drop, leading to contraction and shrinkage of the rocks. Over time, these cycles of expansion and contraction cause the outer layers of the rocks to peel or flake off, similar to the way layers of an onion peel. This process is known as exfoliation.
The exfoliation process is driven by the differential expansion and contraction of different rock layers or minerals within the rocks. The outer layers are under greater stress due to the temperature changes, while the inner layers remain relatively unaffected. As a result, the outer layers gradually detach from the underlying rock, creating concentric layers that resemble the shape of a dome.
Exfoliation domes often have smooth, rounded surfaces and can vary in size, from a few meters to several kilometers in diameter. They are commonly found in granite and other coarse-grained rocks that are resistant to chemical weathering but susceptible to mechanical weathering through exfoliation.
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