How is an exfoliation dome formed?

Answer:

-A large rock is exposed to alternate expansion and contraction of the outer layer in a rock.
-This is caused by temperature differences.
-Exfoliation is common in arid areas where during the day the rock surface heats up rapidly and then cools at night.
-Rocks are poor conductors of heat conductors of heat and so there is little or no
heat that is transferred to the inner layers.
-The minerals of the outer layers expand at a higher rate than those in the inner
layers.
-This causes strain to result between the two layers and with time the outer shell will
develop cracks and later peel off.
-Once the material is peeled off and rolled away a smooth dome shaped rock is left behind.
-It is called Exfoliation dome.

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