Question

The sun is the main source of energy.This form of energy is very popular nowadays.
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The worlds second most important source of energy. It’s a fossil fuel
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Flowing water is used as power of source.it is less costly than mining fossil fuels.
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Answer 1

Explanation:

The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.