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1. Fossil fuels such as natural gas are found inside the earth's crust. They are created over millions of years by natural processes such as the decomposition of buried dead animals.
2. Solar cells are based devices that convert into electricity directly. into electricity directly.
3. are found deep inside the earth's crust, which are energy-rich substances created over millions of years by natural processes such as the anaerobic decomposition of buried dead animals.
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