The rocks that are made of bits and pieces of pre-existing rocks and minerals cemented together are called clastic sedimentary rocks.
Clastic sedimentary rocks are composed of old earlier pieces of rocks which are carried away by wind and water and are deposited in to a depression.
Such rocks pieces are formed by natural erosion processes such as weathering which erodes the rock layers by disintegrating them.
Lose and dispersed rock fragments are carried away and get trapped into basin.
If layers of rocks are accumulated over one another and the rock becomes deeply buried then it is gradually transformed into sedimentary rock.
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