Exfoliation or flaking of rocks due to expansion in extremely high daytime temperatures with contraction in extremely low nighttime temperatures is a form of - b) physical weathering.
Physical weathering
Physical or mechanical weathering is the breaking of the rocks without changing their chemical composition. It includes any process that can disintegrate rocks, soil, or minerals other than chemical weathering.
Insolation weathering is a type of physical weathering which causes Expansion of rock surface during the daytime due to high temperatures followed by contraction as the temperature falls during the night can allegedly weaken bonds cause subsequent flaking off of rock fragments or dislodging of mineral grains.
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