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. Calendar #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. Calendar #713899774