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Three ways by which heat can be generated

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Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation). Heat is usually transfered in a combination of these three types and seldomly occurs on its own.
User Steve Keenan
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6 votes

Answer:

burning, rubbing, and mixing one substance with another.

Step-by-step explanation:

User Lithium
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