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Which process results in the formation of sedimentary rocks?
A. Rock fragments are layered and pressurized over time.
B. Rocks are sorted under a glacier as the glacier retreats.
C. Rocks are heated and changed by volcanic forces quickly.
D. Rocks that contain two or more minerals melted together.

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Answer:

A. Rock fragments are layered and pressurized over time.

Explanation:

Sedimentary rocks are derived from pre-existing rocks that have been subjected to agents of denudation, weathered, transported and deposited within a basin.

In the basin, the sediments are accumulated in their final resting position.

  • Sediments are accumulated as layers on top of one another.
  • The pressure of the sediment on top of another forces out water and presses the layers into sheets.
  • Over time, the compression leads to lithification of the rock.
  • During lithification, compaction and cementation occurs.

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