OBJECTIVE FORESTRY

FORESTRY

SOIL SCIENCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A rock formed from fragments of other rocks is a(n)
A
Metamorphic Rock
B
Sedimentary Rock
C
Extrusive Rock
D
Igneous Rock
Explanation: 

Detailed explanation-1: -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.

Detailed explanation-2: -Inorganic detrital rocks, on the other hand, are formed from broken up pieces of other rocks, not from living things. These rocks are often called clastic sedimentary rocks. One of the best-known clastic sedimentary rocks is sandstone.

Detailed explanation-3: -A rock fragment, in sedimentary geology, is a sand-sized particle or sand grain that is made up of multiple grains that are connected on the grain scale. These can include grains which are sand-sized themselves (a granitic rock fragment), or finer-grained materials (shale fragments).

Detailed explanation-4: -Sedimentary rocks are formed by the lithification of inorganic and/or organic sediments, or as chemical precipitates. Clastic sedimentary rocks form when existing parent rock material is weathered, fragmented, transported, and deposited in layers that compact, cement, and lithify to form sedimentary rocks.

Detailed explanation-5: -Compaction: The process of consolidating fine-grained sediments into rock. Lithification: The conversion of loose sediment into solid sedimentary rock. Several processes, including compaction of grains, filling of spaces between grains with mineral cement, and crystallization act to solidify sediment.

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