When it comes to sedimentary rocks, why is it important compaction occurs before cementation? How would cementation be affected if compaction didn't occur and how would this change the forming rock?

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Clastic sedimentary rocks are made of pieces of rock or mineral grains that have been broken from preexisting rock. These particles and grains have become solid rock by the processes of compaction or cementation of sediments. ... When these crystals grow large enough to fill the spaces they harden and form a solid rock.

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