In sedimentary rock formations, which are collections of rock, dead plant and animal materials, and layers of silt, coal is a substance that is frequently present. One type of sedimentary rock that contains oil in its natural state is shale.
Oil and coal are both fossil fuels. That indicates that they were created from organic material, or things that were once living on Earth and covered in thick layers of rock. The decomposed material was eventually converted to coal or oil due to the increased pressure and heat brought on by the underlying rock over time.
The three fossil fuels that make up oil, coal, and natural gas account for 81% of all the energy used in the United States. We rely on those fuels to heat our homes, power our cars, supply electricity to us, and power manufacturing and industry.
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