Across
- 2. a chemical that is sprayed in order to kill unwanted organisms
- 4. include sugars and starches
- 7. turns litmus red
- 8. how acidic/basic something is
- 12. Nutrients needed in very small amounts
- 15. The breakdown of chemicals by light
- 16. a measure of how toxic a substance is. The lethal dose that will kill 50% of a population
- 17. Decreasing the concentration of a chem by adding more solvent
- 19. the breakdown of a chemical in the presence of water
- 21. store genetic material
- 22. air pollutants that trap heat in Earth's atmosphere
- 25. turns litmus blue
- 26. a class of chemicals that cause ozone depletion
- 27. made of smaller pieces called amino acids
Down
- 1. Using plants to remove pollutants from the soil
- 3. known as the silent killer. Comes from vehicle exhaust
- 5. a mixture of chemicals that creates a toxic sludge
- 6. Diffusion of water through a membrane
- 9. The spread of chemicals from high to low concentration
- 10. fats oils and waxes
- 11. contains NPK and helps plants grow
- 13. the breakdown of materials by living things
- 14. a form of nitrogen that is useable by living things
- 18. Nutrients needed in large amounts
- 20. Contain carbon and are often made by living things
- 23. Purified wastewater that will be returned to water ways
- 24. to take in directly like eating food