1. Robert W. Christopherson Tim Schultz Chapter 3 Earth’s Modern Atmosphere

2. Copyright © 2009 Pearson Prentice Hall, Pearson Education, Inc. Review: Atmospheric Profiles The troposphere, stratosphere, mesosphere, and thermosphere are defined based on their A.composition. B.function. C.temperature. D.height above Earth’s surface.

3. Copyright © 2009 Pearson Prentice Hall, Pearson Education, Inc. Reading Figures: Atmospheric Profile What percentage of the total atmosphere lies between 0 and 31 miles (50 km) from Earth’s surface? A.0.1 percent B.10 percent C.50 percent D.90 percent E.99.9 percent

4. Copyright © 2009 Pearson Prentice Hall, Pearson Education, Inc. Review: Atmospheric Components Humans have most significantly changed the concentration of _________ in the modern atmosphere. A.argon B.carbon dioxide C.oxygen D.nitrogen E.trace gases

5. Copyright © 2009 Pearson Prentice Hall, Pearson Education, Inc. Review: Stratospheric Ozone Which of the following is least accurate concerning stratospheric ozone? A.It absorbs a lot of ultraviolet radiation and reradiates it at longer wavelengths. B.It was thinning but is now filling back in rapidly. C.Humans are affected by thinning in the ozone layer and have also caused much of the thinning. D.Scientists are still studying the ozone layer to better understand it.

6. Copyright © 2009 Pearson Prentice Hall, Pearson Education, Inc. Review: Variable Atmospheric Components Which of the following prevents vertical mixing of the atmosphere? A.winds B.forest fires C.volcanic landscapes D.temperature inversions

7. Copyright © 2009 Pearson Prentice Hall, Pearson Education, Inc. Review: Variable Atmospheric Components Which of the following would be most likely to cause the damage shown in the photo? A.acid deposition B.forest fire C.photochemical smog D.ozone/chloro- fluorocarbon pollution