Convection Currents and the Mantle by BEv7b3Z

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									     Convection Currents
       and the Mantle
• OBJECTIVES:
 – Explain how heat is transferred
 – Identify what causes convection currents
                 Radiation

• The transfer of energy
  through empty space

• Examples:
  -Sunlight
  -Open flame
Conduction
     • Heat is transferred by
       direct contact of
       particles of matter

     • Heat travels from hot
       to cold

     • Examples:
        – Hot frying pan, Fire
          poker stick
Convection
     • The movement of a fluid,
       caused by differences in
       temperature and density,
       that transfers heat from one
       part of the fluid to another

     • Examples:
       -Heating water
       -Mantle in the
       Asthenosphere
       -Air --wind
           Checkpoint-1
• What are the three types of heat transfer?
         ANSWER-1
• RADIATION

• CONDUCTION

• CONVECTION
          Checkpoint-2
• Describe how convection currents form?
                ANSWER-2
• The heating and cooling of a fluid changes in a
  fluid’s density, and the forces of gravity combine
  to set convection currents in motion.
           Checkpoint-3
• In general, what happens to the density of a
  fluid when it becomes hotter?
                Answer-3
• In general, when a fluid is heated, its
  density decreases. --i.e.steam and ice
          Checkpoint-4
• What happens to convection currents when
  a fluid reaches a constant temperature?
              ANSWER-4
• When a fluid reaches a constant
  temperature, the convection currents stop.

								
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