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Science » Physical Sciences » Energy

Energy Explained

is a brief but comprehensive introduction to energy. Learn what energy is and how it is used. Explore renewable and nonrenewable energy -- oil, coal, gasoline, natural gas, nuclear, hydropower, biomass, biofuels, wind, geothermal, solar, and more. (U.S. Energy Information Administration, Department of Energy)

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Interesting Fact:

The main ingredient in natural gas is methane, a gas (or compound) composed of one carbon atom and four hydrogen atoms. Millions of years ago, the remains of plants and animals (diatoms) decayed and built up in thick layers.
Image of sun shining on grass

Renewable energy


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