Across
- 2. Adding calcium carbonate to neutralize acidified lakes
- 3. measure of concentration of a chemical
- 4. Measurement used to compare toxicity; dose required to kill 50% of a test population
- 6. Energy source for metabolism
- 9. Slippery, bitter-tasting chemical
- 10. Heat, Noise, Chemicals, anything that alters the environment and may cause harm to organisms
- 12. Iron deficiency leading to fatigue and pale skin
- 14. Breakdown of substances by microorganisms
- 17. Variable that is changed to observe and test the hypothesis
- 19. Amount of a substance present in a given volume
- 20. An area of porous rock below ground level which can hold useful amounts of water
- 22. Substance with a pH below 7
- 23. Carbon-containing nutrients needed by living organisms
- 24. Excess fertilizer carried by rainwater to pollute ground and surface water
Down
- 1. The use of living organisms to help clean up areas of pollution
- 5. Structural molecule, one of the four organic macronutrients
- 7. Devices that use calcium oxide as a sorbent to remove sulfur dioxide from factory emissions
- 8. Pollutants that remain in the environment for long periods
- 11. The process that lowers pollutant concentration by spreading it through water
- 12. Bubbling oxygen for bacterial decomposition to help break down smaller waste
- 13. The increase of pollutant concentration as it moves up a food chain
- 15. Potent insecticide that caused harm through bioaccumulation and collateral food web destruction
- 16. Chemicals essential for growth and health
- 18. Scale used to determine whether a substance is acidic, basic, or neutral
- 20. Toxicity of a material that causes harm after a single exposure
- 21. Materials generally derived from non-living sources