What process at the surface of the Earth is part of the formation of sedimentary rocks? A. the cycle of day and night
B. water depositing sediment in layers
C. magma rising from the Earth's mantle
D. rain falling into the ocean

Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock.

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B. water depositing sediment in layers