The document discusses energy transfer through various mediums. It covers 3 main points: 1) Energy can be transferred through conduction, where thermal energy moves through direct contact between particles of matter. 2) Energy can also be transferred through convection, where the transfer of heat occurs in a fluid (liquid or gas). The warmer parts of the fluid rise and the cooler parts sink, creating convection currents. 3) Radiation is the transfer of energy by electromagnetic waves such as light and radio waves. All objects emit electromagnetic radiation, transferring energy even without being in contact.

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