Across
- 4. Protective layer in atmosphere that shields earth from UV radiation.
- 5. process by which pollutants become more concentrated in successive trophic levels of a food web
- 8. air pollution by a mixture of smoke and fog
- 9. measurable long-term changes in averages of temperature, clouds, winds, precipitation, and the frequency of extreme weather events such as floods, major storms, and heat waves
- 14. plants and animals that have migrated to places where they are not native
- 17. The removal of all or most trees in an area of forest
- 18. any harmful material created as a result of human activity and released into the environment
- 19. An effect of the atmosphere that keeps Earth at a temperature that is suitable for life.
- 20. A product of the environment that exists in limited amounts and cannot be replaced for human use within a human lifetime.
- 21. A product of the environment that can be replaced through natural processes within a human lifetime
Down
- 1. An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
- 2. globally significant ecological patterns created by long-term interactions between humans and ecosystems
- 3. A gas that produces the greenhouse effect.
- 6. the total area of healthy land and water ecosystems needed to provide the resources you use
- 7. using resources in ways that meet the needs of people today without hurting the ability of future generations to meet their own needs. This means finding ways to use resources without using them up.
- 10. planting large areas with a single highly productive crop year after year
- 11. The release of harmful substances, or pollutants, into the environment.
- 12. The removal of trees faster than forests can replace themselves.
- 13. A species that is introduced into an ecosystem by human activity.
- 15. A product of the environment that is useful to humans.
- 16. the ability to deal with change and move on