Final answer:
Radiation transfers heat energy through electromagnetic waves like microwaves and visible light without requiring a medium to propagate.
Explanation:
Radiation is the transfer of heat energy by electromagnetic waves, such as microwaves, infrared radiation, visible light, and more. It occurs without the need for a medium to propagate, and examples include sunlight warming the Earth and thermal radiation from the human body.
Learn more about heat transfer by radiation here:
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