what was earth's fossil fuels like millions of years ago
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Years ago, when prehistoric animals and plants died, layers of rock and dirt gradually buried them. Over millions of years, heat and pressure from Earth's crust decomposed these organisms into one of the three main kinds of fuel: oil (also called petroleum), natural gas, or coal.
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Coal was formed millions of years ago, before the dinosaurs. Back then, much of the earth was covered by huge swamps. ... After a long time, the heat and pressure changed the plants into coal. Coal is called a fossil fuel because it was made from plants that were once alive!
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