4.1 Crossword Wesley Woolwine

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Across
  1. 6. a pollution created by substanses of natural origin such as volcanic ash,sea salt particles,photochemically formed ozone and products of forest fibers
  2. 8. a gas that contributes to the greenhouse effect by absorbing infrared radeation
  3. 9. the degree to which the ambient air is pollution free
  4. 10. a agency of the united states frederl goverment whoses mission is to protect human and enviromental health
  5. 11. fog or haze combinded with smoke and other atmospheric pollutants
Down
  1. 1. any substance in air that could harm animals,humans,vegetation,and/or materials such pollutants may be present as solid particals
  2. 2. a gradual increase in the overall temperture in the earth's atmosphere generally attributed to the greenhouse effect caused by the fuel that cars burn
  3. 3. two distinc but related phenomena observed since the late 1970s
  4. 4. when pollutant emittid by cars,power plants and other sources react chemically in the presence of sunlight
  5. 5. the trapping of the sun's warmth in a planet's lower atmosphere
  6. 7. a rain or other form of precipatation that is unuseally acidic