Ch 15 review
Modified T/F
1. Earth’s weather is the thin layer of gases that surrounds Earth.
2. Dry air is 78% nitrogen and 21% carbon dioxide.
3. Burning fossil fuel causes more pollution than soil erosion, dust storms and forest fires
together.
4. Factories produce less air pollution than motor vehicles.
5. Nitrogen oxides react with other air pollutants in the presence of sunlight to form acid
rain.
6. The density of a fixed volume of air increases as its mass increases.
7. As air pressure increases, the column of mercury in a barometer rises.
8. As altitude decreases, the density of the air decreases.
9. People live in the thermosphere, or inner layer of the atmosphere.
10. In the outer mesosphere, temperatures approach -90oC.
Completion
11. The condition of Earth’s atmosphere at a particular time and place is known as ____.
12. Because the atmosphere traps solar energy, water exists in _____ form on Earth for
living things to use.
13. The name of the molecule that is made up of three oxygen atoms is ____.
14. The atmospheric gas called ____ forms clouds when it condenses.
15. The gas that is found in the greatest amount in the atmosphere is ____.
16. Harmful particles and gases in the air are known as air _____.
17. The human activity that causes the most air pollution is the burning of ______.
18. One result of air pollution is ___ , which is precipitation that contains more acid than
normal.
19. Acid rain can form when ____ in the air mixes with sulfur oxides to form sulfuric
acid.
20. The weight of a column of air pushing on an object causes ______.
21. The ____ of air can be calculated if the mass and volume of air are known.
22. Because air has mass, it exerts a force per unit area called ____.
23. A/n _______ barometer measures air pressure by using a metal chamber that is
sensitive to pressure changes.
24. The space above the mercury in the glass tube of mercury barometer is almost a
_____.
25. On a mountaintop, a person runs out of breath quickly because fewer _____
molecules are present per cubic meter of air.
26. The ____ of a mountaintop is its distance above sea level.
27. Animals produce the atmospheric gas ____ , which plants need to live.
28. Satellites orbit in the part of the thermosphere called the ____.
29. In the part of the atmosphere called the ___, solar particles hit atoms and cause them
to glow.
30. The ___ extends from the top of the troposphere to the bottom of the mesosphere.
Answers
1. F, atmosphere
2. F, oxygen 3. T 4. T 5. F, photochemical smog
6. T 7. T 8. F, increases
9. F, troposphere
10. T
11. weather 12. liquid
13. ozone
14. water vapor
15. nitrogen
16. pollutants
17. fossil fuels
18. acid rain
19. water
20. air pressure
21. density 22. pressure 23. aneroid
24. vacuum
25. oxygen
26. altitude
27. carbon dioxide 28. exosphere
29. ionosphere
30. stratosphere