Chapter 1-2
Convection and the Mantle
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
Heat always moves from warmer to cooler
Three types of heat transfer

Radiation – transfer of energy through space
 No direct contact between heat source and object
 Ex. Sunlight, heat from an open fire

Conduction – transfer within a material or between
materials touching
 Ex. Metal spoon in a pot of hot soup – you touch the
spoon and the heat conducts from the spoon to your
skin.
Figure 8, p. 15
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Convection – transferred by the movement of fluids.
 Movement of currents within a fluid
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Convection Current – the flow that transfers
heat within a fluid
Continue as long as heat is added.
Heat from the core and the mantle itself causes
convection currents in the mantle.
Figure 9, p. 16
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
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Heat from the core and
the mantle cause
convection currents in
the mantle.
The mantle flows very
slowly
Heats up at the bottom
of the mantle, rises up,
cools, sinks back down.
Figure 10, p. 17