On the basis of the shape of rocks and the presence of cracks and joints in rock

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On the basis of the shape of rocks and the presence of cracks and joints in rocks, four types of disintegration occur. Choose the one which is wrongly described.

Options:

A . Rocks which have developed cracks and joints break off at these cracks. This process is more active on metamorphic rocks. This process is called block separation.

B . Rocks formed of big coarse grains disintegrate into small coarse grains and form bajri and sandgrains are called granular disintegration.

C . In the process of shattering the outer shells of massive and hard rocks are shattered near new joints. In this type of disintegration rocks are broken into come type pieces with sharp edges.

D . Exfoliation is the process in which layers of rock are peeled off in concentric shells like that of an onion. When one after another layer is peeled off a dome like shell is left over.

Answer: Option A
Answer: (a)
Block separation:
Rocks that have developed cracks and joints break off at these cracks. This process is more active on sedimentary rocks. In the case of sedimentary rock, cracks occur near the surface of the earth and rocks disintegrate into almost rectangular pieces.

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