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Across 1. @78% of earth's atmosphere, colorless, odorless, unreactive gas 4. a clump of matter that appears as a streak of light in earth's atmosphere due to friction 5. a long period of really dry weather that leads to a shortage of water 8. can see it at night, it glows 13. mid to late 20th century increase in carbon dioxide, causing a shift in global climate patterns (2 Words) 19. scientist who studies weather, weatherman or weatherwoman 20. second layer of earth's atmosphere, above the troposphere 21. people forced to leave their homes due to climate changes in their environment (2 Words) 26. using the least amount of energy possible to perform a task (2 Words) 28. a way to remove carbon from the atmosphere and store it in solid or liquid form (2 Words) 30. outer layer of the atmosphere; beyond is "space" 34. colorless, odorless gas caused by burning fuel; plants use it for photosynthesis; you breathe it out (2 Words) 35. international agreement to reduce greenhouse gases globally, made in 1997 (2 Words) 36. radiant energy put out by the sun (2 Words) 38. energy from a source that doesn't get "used up" when employed; examples are solar and wind (2 Words) 39. colorless, odorless, reactive gas, life giving part of "air" 40. the shift from farming/agriculture to industry and machine manufacturing (2 Words) 41. colorless, odorless, inert gas, used in welding, lasers, and electric bulbs

Down 2. layer of the stratosphere, absorbs most of the ultraviolet radiation from the sun (2 Words) 3. layer of the atmosphere between the stratosphere and the thermosphere 6. gradual increase in the overall temperture of the earth's atmosphere (2 Words) 7. natural fuels like coal, gas, and oil formed in the past from the remains of living things (2 Words) 9. trapping of the sun's warmth in the lower atmosphere, causing warming (2 Words) 10. gases that absorb solar radiation and trap heat; carbon and chloroflourocarbons (2 Words) 11. the "envelope" of gases surrounding the earth, has five layers 12. lowest (closest to earth) region of the atmosphere 13. weather conditions in a particular environment 14. covering of ice over a large area, as in Greenland, or the North and South Poles (2 Words) 15. cans that use a chemical to spray paint, polish, insectisides, deoderant, etc. (2 Words) 16. refrigerants, cleaning solvents, and spray can propellants that deplete the ozone in the atmosphere 17. rain, snow, sleet, or hail that falls to the ground 18. scientist who studies climate conditions 22. short length radiation, or invisible rays from the sun, can burn skin and cause skin cancer, the atmosphere shields people from some of its effects (2 Words) 23. slowly moving mass of ice formed by snow pack in northern climates/at the poles 24. long period of cooler tempertures, ice sheets and glaciers get bigger (2 Words) 25. gases made to be used in industry (2 Words) 27. water molecules suspended in the air, produced by evaporation (2 Words) 29. colorless, odorless, flammable (will burn) gas, comes from break down of organic matter, also found in cow farts and burps 31. water formed by the melting of snow or ice, especially from a glacier 32. another, more common name for a meteor (2 Words) 33. scientist who studies the physical features of the earth and its atmosphere 36. the height of ocean water when compared to known locations on land (2 Words) 37. inert gas used in flourescent lamps and advertising signs