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Radiation occurs in the form of electromagnetic waves. It is the emission of energy, or heat in this case, through space or a material medium.
Radio waves, microwaves, and visible light are all forms of electromagnetic radiation. These applications are in our everyday lives. When one listens to music or heats up food, electromagnetic waves are emitted. Other than electromagnetic radiation, there is also thermal radiation in which refers to the emission of heat. When one sits next to a campfire, he/she will feel warmer due to the transfer of heat via thermal radiation.
The sunlight necessary for life to exist is considered the thermal radiation from the Sun. Earth also emits thermal radiation, however, less in intensity compared to the Sun.
