Natural gas (methane, CH4) comes from the decomposed remains of ancient plants and animals. The erosion process carried these biological remains down rivers and streams onto shorelines, where they were deposited along with mud and silt. Intense heat and pressure transformed these fossils into hydrocarbons- chemical compounds of hydrogen and carbon atoms. Depending on the arrangement of the atoms, what were once sea plants and animals are now natural gas or crude oil deposits contained in the earth’s crust.
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