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www.reference.com/article/different-types-energy-sources-d4b612fcdeecb698

Non-renewable and renewable energy sources are the two types of energy. As the names state, non-renewable sources such as fossil fuels are not able to be used again. Renewable sources such as wind can be used over and over again.

www.reference.com/article/sources-chemical-energy-c67ba73937e7cfed

Chemical energy is that which is either released or absorbed when a chemical reaction takes place, such as the release of heat and electrical energy from a hydrogen fuel cell. Another example is the heat release derived from burning wood or other organic substances. Bur...

www.reference.com/article/source-sun-s-energy-76b4d49cced4ee03

The sun's energy comes from thermonuclear fusion reactions. Because the sun's gravity is so strong, hydrogen atoms fuse together to form helium. When they do so, they release a tremendous amount of energy.

www.reference.com/article/ultimate-source-energy-9680828053141cd0

The ultimate source of energy is the sun. It sustains virtually every aspect of life on Earth. Other sources of energy, both renewable and nonrenewable, either directly or indirectly depend on the sun.

www.reference.com/article/sources-conventional-energy-b276354a3eec0d7f

The main sources of conventional energy include coal, oil, natural gas and nuclear power. These sources are known as non-renewable sources of energy because they cannot be replenished once used.

www.reference.com/article/main-energy-source-planet-165c0bcd866e724c

The main source of energy for the planet is the sun. Solar energy includes light, radio waves and X-rays, all of which provide energy on Earth.

www.reference.com/article/thermal-energy-source-d004579670055326

The two primary thermal energy sources are geothermal and solar thermal, according to the Oregon Department of Energy. Geothermal energy uses heat from the earth. Solar thermal energy uses heat from the sun. As thermal energy is heat, the most efficient way to use it is...