Weathering and Soil — Geography STD 7 — Question

Granular disintegration :
A form of weathering where the grains of a rock become loosened and fall out to leave a pitted and uneven surface.
Exfoliation :
When the surface layers of rounded and boulders gradually peel off in layers due to expansion of the outer layer during the day and the contraction of the same layer during night, the process is called exfoliation.