The sun produces heat from
nuclear reactions deep inside it. All life on the
earth depends on this heat.
Friction -- the rubbing of
one object against another -- produces heat.
Survivalists (and Boy Scouts) learn to start a
fire with friction.
Chemical reactions produce
heat by causing a chemical change in substances.
The fire of a match is the result of a chemical
The Earth contains much heat
deep inside. Some of this heat escapes to the
surface when a volcano erupts.
The World Book Encyclopedia
Chicago: World Book-Childcraft International,
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This page was last updated on 09/24/2015.
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