Across
- 2. Colorless, odorless gas; at ground level, it’s a pollutant produced as a result of industrial processes and the use of major vehicles; high in the atmosphere, it forms a layer protection Earth from the sun’s ultra violet radiation.
- 4. No0x(g);major air pollutant; forms when the nitrogen combines with oxygen as a result of fuel combustion.; gives smog its characteristic brown color; major source: motor vehicles.
- 5. measurement used to describe very small concentrations of chemicals; a solution having a concentration of 1 ppm has one part of solute per million parts of solution.
- 7. gases in earth’s atmosphere that trap the heat that forms when radiant energy from the sun reaches the earth’s surface; water vapor, carbon dioxide, methane, and nitrogen oxide are all greenhouse gases.
- 8. The surroundings or conditions in which a person, animal, or plant lives or operates.
- 11. Concentration of acid that can dramatically lower the pH b of the water in a pond, slough, lake , or river for a short period of time; occurs in areas acid precipitation is a problem and acidic deposits build up in ice and snow in the winter; in spring, when the ice and snow melt, the acid meltwater flows into aquatic systems.
- 14. (CO (g)) colorless, odorless gas; produced by incomplete combustion of chemicals containing carbon (e.g. hydrocarbons); major source: motor vehicles.
- 15. Animals without backbones.
- 17. Layer O3 (g) in the atmosphere 15 to 50 km above earth’s surface; protects Earth’s surface from the ultraviolet radiation.
- 18. Poison; substance that produces serious health problems of death when introduced into an organism.
- 19. Lethal does 50; amount of a substance that causes 50% of a group of test animals to die if they are given a specified dose of the substance all at once.
- 20. The envelope of gases surrounding the earth of another planet: “part of the sun’s energy is absorbed by the earth’s atmosphere.
Down
- 1. metal that has a density of 5 or higher. (e.g., copper, zinc, lead, mercury, cadmium, nickel); heavy metals are one type of substance monitored to determine water quality.
- 3. greenhouse effect made greater by human activities, such as burning fossil fuels and clearing land, which add greenhouse gases to the atmosphere.
- 6. Used to kill pests.
- 9. increased average temperatures worldwide caused by the enhanced greenhouse effects.
- 10. How poisonous a toxin is.
- 12. A colorless, odorless, incombustible gas, CO2, formed during respiration, combustion, and organic decomposition and used in food refrigeration, carbonated beverages, inert atmospheres, fire extinguishers, and aerosols. Also called carbonic acid gas.
- 13. (SO2(g)) forms when sulfur combines with oxygen in the air; major air pollutant that forms both smog and acid rain; major source: industrial processes.
- 16. keeping track of something for a specific purpose; certain chemicals are monitored in the environment to ensure they do not exceed safe levels.