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Across 5. Using practices that prevent the loss of water. 6. A fuel that is used in place of gasoline or diesel fuels. May be manufactured from farm crops or use renewable natural resources. 7. The loss of soil by wind or water. 9. A domesticated animal that returns to the wild. 10. The outer layer of the earth's surface. It supports terrestrial plant life. 11. The physical area where organism lives. 12. A material that has never lived. Often thought of as rocks. 13. Our surroundings. 14. Keeping resources without using them. 15. Using practices that make it possible to produce forever. 16. Practices that help protect the soil. 17. A resource that is replaced after it is used. 18. One that is threatened with becoming extinct. 19. Reusing the materials used to make a product.

Down 1. All living things that have not been domesticated. 2. The wise use of resources. using resources as needed and taking the steps to make sure they are available in the future. 3. A resource that is not replaced after it is used. 4. A material used to provide energy. These were formed over thousands of years by the decay of plant & animal material. 7. The complete disappearance of organisms from the earths. 8. The mixture of gases that covers the earth. It contains a gas mixture of nitrogen, oxygen, carbon dioxide, hydrogen, argon, and others