Across
- 2. converts organic materials into a nutrient-rich soil
- 3. long-term heating of Earth's surfaces
- 4. layer of the earth's atmosphere above the troposphere
- 8. (CO2, CH4, CFC, NOx, O3, H2O) are examples of...
- 11. study of the relationships among living organisms and their physical environment
- 14. destruction of waste materials by burning
- 15. recovery and reprocessing of waste materials for use in new products
- 17. concentration of toxins in an organism
- 20. emitted from rice paddy
- 23. waste with properties that make it dangerous
- 24. part of the ocean that is close to shore and consist of plants
- 25. buildup of chemicals in an organism, usually affects organisms high up the food chain
Down
- 1. colorless, highly toxic, and flammable gas at room temperature
- 5. species in danger of extinction
- 6. controlled amounts of water to land to help crops grow
- 7. symptoms appear suddenly and lasts for a short amount of time
- 9. surface mining at the summit of a mountain
- 10. movement of saltwater into bodies of freshwater
- 12. ecologic material from which soil horizons form
- 13. fertile land becomes desert
- 16. removes contaminates from water when pressure forces it through a semipermeable membrane
- 18. heat energy from the earth
- 19. harnessed light and heat that come from the sun converted to energy
- 21. amount of material that kills 50 percent of a test sample
- 22. measure of relative clarity of a liquid