Which of the following is not true about sedimentary rocks?
a. they are formed through compaction and cementation.
c. they are formed from igneous rock fragments.
b. they are made up of sediments.
d. they are not part of the rock cycle.?

The option d is correct.

The sedimentary rocks are notformed from igneous rock fragments.

Further Explanation:

Justification for correct and incorrect

Sedimentary rocks: These rocks are formed by deposition or accumulationof small rock particles and then cementation of organicor mineralparticles on the oceansfloor or otherwater bodies at the Earth's surface.

a.  

They are formed through compaction and cementation: This option is incorrect.

The sediments are deposited and then they are compacted in order to reduce the pore space and removing the water in the pores. The minerals dissolved in the water precipitate to form mineral crusts upon the sediment and then cementing the sediments to form a sedimentary rock.

c.

They are formed from igneous rock fragments: This option is incorrect.

The igneous rocks are formed when the magma cools down becomes solid. These rocks are converted into sedimentary rocks by erosion and weathering.

b.  

They are made up of sediments: This option is incorrect.

These rocks are formed when sediment through air, ice, gravity, wind, or water flows carrying the particles are deposited. The sediments are formed by weathering and erosion of a rock.

d.  

They are not part of the rock cycle: This option iscorrect.

The rocks cycle refer to conversion of the igneous rock into sedimentary rock or metamorphic rock. Sedimentary rock can also beconverted into metamorphic rock or igneous rock. Metamorphic rock can also beconverted into igneous rock or sedimentary rock.

The option d is correct.

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Answer details:

Grade: High School

Subject: Geography

Chapter:Formation of rock

Keywords:Which of the following is not true about sedimentary rocks, they are formed through compaction and cementation, they are formed from igneous rock fragments, they are made up of sediments, they are not part of the rock cycle.

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