The Atmosphere

2. Meteors burn up in this layer.
4. The ozone layer protects us from the sun's _______ rays.
6. This type of smog is produced when soot combines with Sulphur compounds and water in the air.
8. These type of air pollutants can be caused from volcanic eruptions, dust storms, wildfires.
12. The thin layer of gases that surrounds. Earth.
13. This device in motor vehicles that reduce the amount of air pollutants in emissions.
15. The transfer of heat energy by currents. Either within a flued or circulating air.
16. The release of damaging materials into the atmosphere.
18. Instruments used to measure air pressure.
19. This layer contains the ozone layer.
20. An unhealthy mixture of air pollutants that may form over cities and nearby areas.

1. Carbon-containing fuels that formed millions of years ago from the remains of living things.
3. A family of chemical compounds containing chlorine, fluorine, and carbon.
5. This layer is home to the International Space Station.
7. The transfer of heat directly between two objects that are in contact with one another.
9. The transfer of heat energy through empty space.
10. This treaty called for major cuts in CFC manufacture.
11. Most weather occurs in this layer of the atmosphere.
14. This removes pollutants or changes them chemically before they leave the factory smokestacks.
17. The boundary between air masses that differ in temperature and moisture.