2. Distinguish between the troposphere, stratosphere, mesosphere, and thermosphere.
3. Define ozone and explain why the ozone layer in the upper atmosphere is so important.
4. List some of the uses of chlorofluorocarbons (CFCs) and describe their effect on the ozone layer.
5. Define what is meant by saturated air.
6. List the ways in which clouds come into being.
7. Describe what causes rain and snow to fall from a cloud.
8. Describe the difference between sleet and hail.
9. Define insolation and describe the greenhouse effect.
10. Discuss why temperatures vary around the earth.
11. Explain how the seasons of the year originate.
12. Describe what is meant by a convection current.
13. State the influence of the coriolis effect on wind direction in the northern and southern hemispheres.
14. Sketch on a map the main surface wind systems of the world and name them and the belts of relative calm that separate them.
15. Explain what a jet stream is.
16. Compare cyclones and anticyclones and describe the motion of air in each of them.
17. Compare warm and cold fronts and describe what happens when a cold front overtakes a warm front.
18. Distinguish between weather and climate.
19. Describe the ice ages and the variations in the earth's motions that may be responsible for them.
20. Discuss the relationship between the carbon dioxide content of the atmosphere and global warming.
21. List the ways in which the oceans affect climates.