Unit 7 The Atmosphere

4. (two words) Tiny solid or liquid particles suspended in the air that can harm human health.
6. A thin layer of gases surrounding Earth that makes life possible.
9. (two words) Smog formed when sunlight reacts with nitrogen oxides and volatile organic compounds.
14. (two words) Long term changes in temperature, precipitation patterns, and other aspects of Earth’s climate.
15. (two words) A pollutant emitted directly from a source into the atmosphere.
16. The lowest layer of the atmosphere where weather occurs.
17. (two words) The increase in the average temperature of Earth’s surface.
18. A gas composed of three oxygen atoms that absorbs harmful ultraviolet radiation in the stratosphere.
20. (three words) The strengthening of the natural greenhouse effect due to increased greenhouse gases from human activities.

1. Adjustments made to natural or human systems to reduce harm from the effects of climate change.
2. (two words) A region of the stratosphere with a high concentration of ozone that absorbs ultraviolet radiation.
3. (three words) An increase in the average level of the world’s oceans due to thermal expansion and melting ice.
5. (two words) A natural process in which certain gases in the atmosphere keep heat near Earth and prevent it from radiating into space.
7. (two words) A pollutant that forms when primary pollutants react in the atmosphere.
8. (two words) A periodic warming of surface waters in the eastern Pacific Ocean that affects global weather patterns.
10. (two words) A greenhouse gas released naturally and by human activities such as burning fossil fuels.
11. Efforts to reduce the causes of climate change such as lowering greenhouse gas emissions.
12. A powerful greenhouse gas released by natural processes and human activities.
13. (two words) The release of harmful substances into the atmosphere.
19. (two words) A gas in the atmosphere that absorbs heat and releases it slowly, helping warm the troposphere.