Energy is conserved , meaning it can neither be created nor destroyed . the energy we use forn heat, movement, and light must all come from an energy source. for example , we can realease energy by burning fuels or we can use energy carried by radiation from the sun.
A primary energy source is one that is found or occurs naturally examples include fuels such as coal, oil, natual gas, and wood. Wind waves , and sunlight are also primary energy souces.
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