Here's why:
* Exfoliation is a geological process where layers of rock peel or flake off due to various factors.
* Causes of exfoliation:
* Pressure release: When a large body of rock, like a mountain, is exposed after being buried deep underground, the pressure on it decreases. This change in pressure causes the outer layers to expand more than the inner layers, leading to stress and eventually exfoliation.
* Thermal expansion and contraction: Rocks expand when heated and contract when cooled. This repeated process can cause stresses that lead to exfoliation, especially if there are temperature differences between the surface and the interior of the rock.
* Chemical weathering: Chemical reactions with water or other substances can break down the rock's structure, making it more susceptible to exfoliation.
Examples of exfoliation:
* Granite domes: The iconic rounded granite domes found in places like Yosemite National Park are formed by exfoliation.
* Onion-skin weathering: This type of weathering, where layers of rock peel off like onion skin, is a classic example of exfoliation.
Let me know if you have any other questions!
