1. II)Convection in the Mantle
EQ: How is heat transferred?
What causes convection currents?

2. A) Heat
Transfer

3. In a room why is it cooler near the floor than near the ceiling?

5. Hot is Hot
Cold is Not

6. Heat

7. A) Heat
Transfer

8. A)Heat Transfer
The movement of energy (heat) from a warmer object to a cooler object. or

9. There are three types of heat transfer:

10. 1) Radiation

11. 1) Radiation
empty space
heat transfer through empty space

12. All these forms of radiation together are called the Solar Wind.
a. Heat from
the sun
The Sun's Radiation:
     The sun emits many kinds of radiation. Heat is only a part of what it emits.
     The sun also emits light, radio waves, gamma radiation, ultraviolet and infrared radiation.
     All these forms of radiation together are called the Solar Wind.

13. b. heat from an open flame or other local heat source
1) Radiation
b. heat from an open flame
or other local heat source

14. Mr. Ray Radiation

15. 2) Conduction

16. 2) Conduction
heat transfer by direct contact (touching)

17. Mr. Conduction
Conductor

18. 3) Convection

19. Heat goes higher. Hot air, hot water, and hot rock all tend to rise.
3) Convection
fluid
heat transfer by the movement of a heated fluid
Heat goes higher. Hot air, hot water, and hot rock all tend to rise.
Cold creeps lower. Cold air, cold water, and cool rock all tend to sink.

20. B)Density

21. Density Facts
(video)

22. B) Density 1) How much mass there is in a volume of a substance
2) volume is the amount of space an object takes up
3) When a fluid’s temperature increases
its particles move faster
its particles occupy more space
density decreases

23. C) Convection
Currents

24. C) Convection Currents
In this pot, the liquid close to the heat source is hotter and less dense than the liquid near the surface. These differences in the temperature and density cause convection currents.
1) the current created by the rising of a heated liquid and the sinking of a cooling liquid
2) differences in temperature and density along with the force of gravity cause convection currents

25. D) Convection Currents
in the Mantle
(video)

26. What part of Earth’s interior is like the soup in the pot?
What part is like the burner on the stove?
1) Heat form Earth’s mantle and core causes convection currents to form in the asthenosphere.

27. Particles move faster; occupy more space Particles occupy less space
Mantle Rock Cools
Mantle Rock Rises
Particles move faster; occupy more space
Mantle rock is heated
Mantle rock sinks
Particles occupy less space
Particles move slower
Density decreases
Density increases

28. Review

29. What is heat transfer?
the movement of heat (energy) from a warmer object to a cooler object.

30. What are the three types of heat transfer?
Convection, conduction, and radiation

31. What is heat transfer through empty space?
radiation

32. What are two forms of RADIATION?
sunlight and heat form an open flame (fire)

33. What is heat transfer by direct contact?
conduction

34. What is heat transfer by the movement of a heated fluid?
convection

35. Explain density.
a measure of how much mass there is in a volume of a substance.

36. What causes convection currents to occur?
differences of temperature and density

37. What happens to the density of a fluid when its temperature increases?
it decreases

38. In what layer of the Earth do convection currents occur?
asthenosphere

39. What is the heat source for the convection currents in the asthenosphere?
Earth’s mantle and core