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What is the ultimate source of energy for all fossil fuels?

The ultimate source of energy of fossil fuels is the ancient sunlight trapped millions of years ago by algae and plants through the process of photosynthesis. Over time, the buried remains of these organisms underwent transformation into fossil fuels, such as coal, oil, and natural gas. These fuels still carry the chemical potential energy associated with the sunlight absorbed during photosynthesis, which is released as heat energy when combusted.