Where does the stored energy in fossil fuels originally come from, before it changed forms several times?

• Correct Answer: the sun
• decomposers
• the Moon
• Earth's core

Explanation: Fossil fuels contain stored chemical energy that came originally from the sun. Ancient plants changed energy in sunlight to stored chemical energy in food, which was eaten by other organisms. After the plants and other organisms died, their remains gradually changed to fossil fuels as they were pressed beneath layers of sediments. Petroleum and natural gas formed from marine organisms and are often found together. Coal formed from giant tree ferns and other swamp plants.

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