Across
- 2. another name curreny
- 5. this fell on Issac Newton's head
- 8. wise management of natural resources
- 9. the atmosphere contains a relatively high concentration
- 11. concentration of a harmful substance increase in organisms
- 13. a mixture of chemicals in the atmosphere that appear in the form of a gray-brown haze
- 15. developments often split ecosystems into smaller habitats
- 16. raising of aquatic animals for human consumption
- 19. when a once productive area turns into desert as a result of overgrazing and drought
- 20. increases in average temperature of the biosphere
- 21. missing link
- 22. resources that can be regenerated
- 23. the sum total of all the different forms of genetic informationcarried by organisms
- 25. a new species that reproduces rapidly
Down
- 1. the wearing away of surface soil by wind and water
- 3. when modern technology was introduced to farming
- 4. loss of forests
- 6. a harmful material that can enter the biophere
- 7. what Mcdonalds makes you
- 10. large fields are planted with a single crop
- 12. resources that can't be replenished
- 14. the sum total of the genetically based variety of all organisms in the biosphere
- 17. a species disappears
- 18. a species that about to go extinct
- 24. has a lot of bark