Answer :
Petroleum and natural gas form from heat and pressure over time being applied to organic rich sediments.
The accumulations of undigested biological tissue that make up coal, oil shale, and petroleum are not sedimentary rocks; instead, they are sedimentary accumulations of mud rocks, sand stones, and carbonates. Coal, for example, may make up the majority of the material (e.g., oil shale and petroleum). Humus, or plant matter that builds up in soil, makes up a large portion of the organic matter that hasn't decomposed in sediment and sedimentary rocks.
Because they are composed of the undamaged organic tissue of plants and animals preserved in environments defined by a lack of free oxygen, organic-rich sedimentary rock deposits are collectively referred to as fossil fuels.
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