Answer :
The organic sedimentary rock that is composed of mud-sized particles and partially decayed organic matter derived from plankton and algae remains is oil shale.
Oil shale is a fine-grained sedimentary rock that contains a high percentage of organic material, typically in the form of kerogen, a precursor to crude oil. Oil shale is formed from the accumulation of organic-rich sediment on the bottom of ancient lakes or seas. Over time, the organic material is buried and subjected to heat and pressure, causing it to break down and release hydrocarbons, such as oil and gas. Fossiliferous limestone is a type of limestone that contains visible fossils, such as shells or other marine organisms. Coal is a type of organic sedimentary rock that is formed from the accumulation and compression of plant material. Chert is a hard, dense, sedimentary rock composed of microcrystalline quartz.
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The correct answer is c. oil shale. Oil shale is an organic sedimentary rock composed of mud-sized particles and partially decayed organic matter derived from plankton and algae remains, undergoing burial and compaction. Oil shale is an important source of hydrocarbons.
This rock forms when organic material mixed with sediments undergoes burial, compaction, and lithification.
Oil shale is formed primarily in sedimentary basins where large quantities of organic material, especially from marine microorganisms, accumulate. Over time, these materials become buried and subjected to heat and pressure, converting them into kerogen, a precursor to oil and gas. Upon further heating, these rocks can release hydrocarbons, explaining their association with oil.
