What is energy? Give two source of it?
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Primary energy sources take many forms, including nuclear energy, fossil energy -- like oil, coal and natural gas -- and renewable sources like wind, solar, geothermal and hydropower.
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Energy is a capacity of a physical system to perform work energy exist in several form such as heat Kinetic or mechanical energy ,light, potential energy ,electrical energy are other farm energy is a ability to do work energy source could be classified as renewable or nonrenewable.
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