RHNC+1.2

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 * heat transfer** - movement of energy from hot object to cold
 * radiation** - the transfer of energy through empty space
 * conduction** - heat transfer by direct contact of particles of matter
 * density** - measure of how much mass is in a volume of a substance
 * convection** - heat transfer by movement of a heated fluid
 * convection currents** - flow that transfers heat within a fluid


 * ===Radiation===
 * sunlight
 * ===Conduction===
 * heat to cold
 * ==Convection==
 * heat goes from place to place
 * ==Convection in the Earth's Mantle==