KYTL+1.2

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Vocabulary:
Three types:
 * Heat transfer**-movement of energy from a warmer object to a cooler object
 * **Radiation**-energy transfer through empty space
 * **Convection**-heat transfer by movement of a heated fluid
 * **Conduction**-heat transfer by movement of a heated fluid
 * Density**-how much mass in a volume of a substance
 * Convection currents**-flow which transfers heat within a fluid

Summary

 * heat is always transferred from a warmer substance to a cooler substance.

Radiation

 * heat transfer by radiation takes place with no direct contact between the heat source and the object

Conduction

 * the heated particles of a substance transfer heat to other particles through direct contact

Convection

 * during convection,heated particles of fluid being to flow,transferring heat energy from one part of the fluid to another

Convection in Earth's Mantle

 * Earth's mantle responds to heat
 * Convection Currents in Asthenosphere
 * convection currents have been moving for more than four billion years
 * at the top of the asthenosphere,hot material spreads out and pushes the cooler material out of the way,then the cooler material sinks back into the asthenosphere