Answer
Coal, oil, and natural gas are called fossil fuels because they are formed from the remains of ancient organic matter (plants and animals) that lived millions of years ago. All three fuels originated from organic material, but they formed under different circumstances. Coal was formed from the remains of plants that accumulated in swamps and underwent compaction and heat over time. Oil and natural gas were formed from marine organisms in ancient seas, where their organic material was subjected to heat and pressure, transforming into hydrocarbons.
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