Which one among the following is a mechanically formed sedimentary

Which one among the following is a mechanically formed sedimentary rock:

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Salt rock

Limestone

Sandstone

Gypsum

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This question was previously asked in

UPSC CAPF – 2012

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Mechanically formed sedimentary rocks, also known as clastic sedimentary rocks, are composed of fragments (clasts) of pre-existing rocks that have been eroded, transported, deposited, and then cemented together. Sandstone is a classic example of a clastic sedimentary rock, formed from cemented sand grains. Salt rock (halite) and Gypsum are typically chemical sedimentary rocks formed by evaporation and precipitation of minerals from water. Limestone can be chemical or organic (biogenic), but sandstone is definitively mechanically formed.

Sandstone is a clastic (mechanically formed) sedimentary rock composed of rock fragments (sand grains).

Clastic sedimentary rocks are classified based on the size of the clasts (fragments). Examples include conglomerate (rounded pebbles/cobbles), breccia (angular pebbles/cobbles), sandstone (sand-sized grains), siltstone (silt-sized grains), and shale (clay-sized grains).

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