Sediment to form a sedimentary rock

a: melts
b: weathers
c: crystallizes
d: compacts and is cemented

Explanation:

Sedimentary rocks are the rocks that are formed by the accumulation of small particles also called as sediments. These rocks are formed by the compaction or cementation of organic and inorganic particles  coming from the animals, plant source and weathering of other parent rocks, organic particles from the oceanic floors all contributes to the formation of the sedimentary rocks.  

The sedimentary rock weathers to form the sediments. These rocks can come in contact of high speed wind currents, water or any other agent which can distort or disintegrate these rocks into sediments by the process of weathering.

The answer is D: compacts and is cemented

Explanation: The reason is that when a sedimentary rock id formed it is from many other rocks which have been broken up and settled onto the ocean (or some other body of water) floor and is compressed until the partials of the other sediment fuse together and create a new rock.

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explanation: