Grade 9 Unit C Vocabulary

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Across
  1. 5. Toxicity: Adverse effects resulting from a single exposure to a toxic substance.
  2. 7. Chemical reaction that balances acidity and alkalinity.
  3. 9. Environmental contamination that harms living organisms.
  4. 10. Indicator: Organism used to assess environmental quality or pollution levels.
  5. 14. Gradual build-up of substances, such as pollutants, in living organisms.
  6. 16. Pollutant: Environmental contaminant that breaks down relatively quickly.
  7. 17. Chemical used to control or eliminate pests.
  8. 19. Liquid that drains or leaches from a landfill, often containing pollutants.
  9. 20. Toxicity: Harmful effects arising from prolonged or repeated exposure to a substance.
  10. 21. Substance with a pH greater than 7, capable of accepting protons.
  11. 23. Substance with a pH less than 7, capable of donating protons.
  12. 25. Use of living organisms to clean up or neutralize pollutants in the environment.
  13. 26. Pollutant: Harmful substance that remains in the environment for a long time.
  14. 27. Lethal Dose 50%, the dose of a substance causing death in 50% of test subjects.
Down
  1. 1. Organic compound, including sugars and starches, serving as a primary energy source.
  2. 2. Having a pH of 7, neither acidic nor basic.
  3. 3. Natural breakdown of substances by microorganisms.
  4. 4. Layer: Protective layer of ozone in the Earth's atmosphere, shielding against ultraviolet radiation.
  5. 6. Nutrient: Essential substance for organisms that lacks carbon-hydrogen bonds.
  6. 8. Organic molecule, such as fats and oils, important for energy storage and insulation.
  7. 11. Disposal site for waste materials, typically buried and covered.
  8. 12. Substance applied to soil to enhance plant growth.
  9. 13. Process where toxic substances accumulate in higher concentrations as they move up the food chain.
  10. 15. Nutrient: Compound containing carbon and hydrogen, essential for living organisms.
  11. 17. Measure of acidity or alkalinity in a solution.
  12. 18. Small, spineless creature without a backbone, visible to the naked eye.
  13. 22. Precipitation: Rainfall with an acidic pH due to air pollutants.
  14. 24. Large biomolecule composed of amino acids, crucial for cell structure and function.