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- Oil barrels. Oil is an example of a fossil fuel. Fossil fuels are made from decomposing plants and animals. These fuels are found in Earth's crust and contain carbon and hydrogen, which can be burned for energy. Mouse Pad #713899774
Oil barrels. Oil is an example of a fossil fuel. Fossil fuels are made from decomposing plants and animals. These fuels are found in Earth's crust and contain carbon and hydrogen, which can be burned for energy. Mouse Pad #713899774