1. Where does the heat come from that drives this convection current in
the mantle?

2. Where is the temperature of the mantle material greater, at point A or
point B? Explain why.

3. Where is the density of the material greater, at point B or point C? Explain why.

4. What causes the convection cell to turn to the left at point B?

5. What happens to the temperature and density of the material between
points B and C?

6. What force causes the convection cell to turn down at point C?

7. What happens to the temperature and density of the material between
points D and A?

8. What causes the convection cell to turn up at point A?

9. How do you think this convection cell might affect the crust material
above it?