1. Convection and Density

2. convection currents

3. What are these? lava lamps How do they work?

4. Convection Lab 1.With no heat source, Draw the beaker of water with the paper dots in it. Be sure label the beaker, water, paper dots, heat source and the path of movement of the paper dots (if any).

5. Second Convection Demo

6. 7. a. Draw a picture of what you saw happen in this demonstration. (Label everything thing you can) b.Explain why this happened. (complete sentences) c. What is this called.

7. Brainstorming Convection 8.Brainstorm with a partner and list as many other examples of convection as they can. Pairs share their ideas with the class.

11. 9. Draw one examples of convection?

12. Convection Lab 2.With the heat source,draw the beaker of water with the paper dots in it. Be sure label the beaker, water, paper dots, heat source and the path of movement of the paper dots (if any).

13. Analysis of Data: 3.What are the 2 differences between your observations for Diagram 1 and Diagram 2?

14. Analysis of Data 4. What did the path of paper dots in Diagram 2 represent?

15. Analysis of Data 5. This experiment is a model for processes that occur within Earth’s mantle. What is the heat source driving convection currents in Earth’s mantle?

16. Causes of Plate Motion Heat from the Earth’s core causes materials in the lower asthenosphere to become less dense and rise up. When the materials come in contact with the lithosphere they start to cool down and become denser again. As the cooled magma falls and new heated magma rises, it acts as a conveyer belt moving the lithospheric plates.

17. Analysis of Data 6. Can convection occur within all fluids? Explain using complete sentences.

18. Where is the heat source in the Earth Located?

19. Why is the core so hot?

20. 1. Hot from the formation

22. 2. Heat from radioactive decay. – Elements decaying into other elements and releasing energy

23. Convection At which location in the room will the density of the air be the greatest?

24. Convection Convection: the transfer of heat through the movement of a fluid Heat moves atoms apart causing the density of the material to decrease Density influences the materials in the mantle causing plate tectonic movement and volcanic eruptions

25. Convection Currents The middle mantle "flows" because of convection currents.

26. Convection Currents Convection currents are caused by the very hot material of the mantle rising, then cooling and sinking. Then the process is repeated when the material is heated and rises, then cools and sinks again --repeating this cycle over and over. mantle convection currents mantle convection currents

29. How Do We Know All This, Anyway? We use seismic waves, from earthquakes to find the depth of earth’s layers, like sonar in a submarine.

30. How Do We Know All This, Anyway? We haven’t drilled deeper than the crust Shadow Zones: places on earth where no seismic waves reach why does the earth have layers