LPKW+1.2

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**Volcabulary**
Heat transfer- movement of energy from a warm object- three types,radiation,conduction,and convection Radiation- transfer of energy through empty space Conduction- transfer by direct contact of particles of matter Convection- transfer by the movement of a heated fluid Density- a measure of how much mass there is in a volume of a substance Convection current- the flow that transfers heat within a fluid

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 * transfer energy through empty space
 * energy from sunlight and fire

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//Conduction//
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 * transfer by contact of particles of matter
 * makes other things hot

//Convection//
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 * transfer by movement of a heated liquid
 * heating up liquid

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Convection in Earth's Mantle
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 * heat source for convection currents comes from the core
 * convection currents have been running for more than 4 billion years!!!