"Exfoliation rocks" is not a recognized term in geology. It's likely you're referring to the process of exfoliation, which is a type of weathering that causes rocks to break apart in layers.

Here's what happens during exfoliation:

Causes:

* Thermal Stress: Extreme temperature fluctuations (hot days, cold nights) cause the outer layers of the rock to expand and contract more than the inner layers. This creates stress and can cause the outer layers to flake off.

* Pressure Release: When overlying rock layers are eroded away, the pressure on the underlying rock is reduced. This can cause the rock to expand and crack, leading to exfoliation.

* Chemical Weathering: Chemical reactions, like those caused by acid rain, can weaken the rock and make it more susceptible to exfoliation.

Effects:

* Formation of Rounded Domes: Exfoliation can create large, rounded domes of rock, particularly in granite and other igneous rocks.

* Formation of Sheets: Exfoliation can also produce large, thin sheets of rock that can break off and form talus slopes.

* Altered Landscapes: Exfoliation plays a significant role in shaping landscapes, creating unique rock formations and contributing to the erosion of mountains and hills.

Examples:

* Half Dome in Yosemite National Park: This iconic rock formation is a classic example of exfoliation.

* Stone Mountain in Georgia: The massive granite dome of Stone Mountain is also formed by exfoliation.

While exfoliation is a natural process, it can also be exacerbated by human activities like quarrying and mining, which can create unstable rock faces.

If you have more context about what specifically you're interested in, please provide more details. This will help me give you a more focused and helpful answer.