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Convection Currents and the Mantle

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Presentation on theme: "Convection Currents and the Mantle"— Presentation transcript:

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

2 Radiation The transfer of energy through empty space Examples:
-Sunlight -Open flame

3 Conduction Heat is transferred by direct contact of particles of matter Heat travels from hot to cold Examples: Hot frying pan, Fire poker stick

4 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

5 Checkpoint-1 What are the three types of heat transfer?


7 Checkpoint-2 Describe how convection currents form?

8 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.

9 Checkpoint-3 In general, what happens to the density of a fluid when it becomes hotter?

10 Answer-3 In general, when a fluid is heated, its density decreases. --i.e.steam and ice

11 Checkpoint-4 What happens to convection currents when a fluid reaches a constant temperature?

12 ANSWER-4 When a fluid reaches a constant temperature, the convection currents stop.

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