1) Types Of Metamorphism

a. Regional metamorphism

b. Contact metamorphism

c. Dynamic metamorphism

2) Exfoliation

a. In hot climates, when a rock surface is exposed to a considerable daily range of temperature, as in arid and semi-arid regions, the expansion that occurs during the day and the contraction at night, constantly repeated, weaken the structure of the rock.

b. The outer heated layers tend to pull away from the cooler rock underneath and flakes and slabs split off, a process known as exfoliation.