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Energy
A lighthouse giving off light is using energy in the form of electricity. Image Credit: NASA
the ability to do workSentences:
Astronauts eat a healthy breakfast to give them energy to do their work.
A power plant can provide energy for an entire city
More Information:
http://www.nasa.gov/worldbook/wbkids/k_energy.html
http://www.nasa.gov/worldbook/wbkids/k_fuel.html