Why or why not would we find sedimentary rock underground in the mantle or deep in a volcano?

The most important geological processes that lead to the creation of sedimentary rocks are erosion, weathering, dissolution, precipitation, and lithification. Erosion and weathering include the effects of wind and rain, which slowly break down large rocks into smaller ones. You're most likely to find sedimentary rocks near sources of water, which is where a lot of erosion takes place. Thus sedimentary rocks cannot be found underground in the mantle or deep in a volcano.

Explanation:

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Few sedimentary rocks are found deep inside the Earth because sedimentary rocks form close to the surface of the Earth.

Explanation:

All three types of rock make up the Earth's lithosphere, the outermost layer. ... The lithosphere is solid rock. Sedimentary rocks are the most abundant rock only on the surface of the Earth, but igneous and metamorphic are abundant deeper into the mantle.