Here's a breakdown of the process:
* Cause: Exfoliation is primarily caused by pressure release when overlying rock is removed (like erosion) or by thermal expansion and contraction due to temperature changes.
* Mechanism: As pressure is released, the rock expands, causing internal stresses. This stress can lead to fractures forming parallel to the surface, creating layers or sheets.
* Types: There are two main types:
* Sheeting: Large, relatively flat sheets break off. This often happens in large igneous intrusions (like batholiths).
* Spheroidal weathering: Rocks weather in a rounded shape, often seen in granite.
Let me know if you'd like to explore any of these aspects further!
