AUFC+1.2

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Vocabulary

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

Radiation

 * Transfer of energy through empty space
 * sunlight

Conduction

 * heat transfer by direct contact of particles of matter
 * soup heats spoon
 * hand melts snow

Convection

 * heat transfer by the movement of fluids
 * caused by different temperature and density
 * rock is more dense than water
 * when fluid is heated particles move faster
 * density decreases
 * convection current
 * warm soup rises to top and cools
 * gravity pulls it down and becomes heated

Convection in Earth's Mantle
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 * convection currents flow in asthensophere
 * have been there over four billion years