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Fossil fuels form when plants and animals that lived millions of years ago were compressed underground and gradually transformed into coal, oil, and natural gas. These fuels are like stored energy hidden deep within the Earth. But this energy can harm the environment. Coal Coal forms when vast forests that existed millions of years ago were buried underground and transformed over time into a hard, rock-like substance. The trees and plants in these forests, deprived of oxygen while submerged in m