Geography

4. the wearing away of the earths surface by wind, water, or ice
7. a gas, such as carbon dioxide, that absorbs radiation from the suns rays, trapping heat in the atmosphere
11. the removal of trees and other plant life for a forest area
12. all the gasses that surround the earth
14. the negative effects of invasive species that do harm to the enviroment
16. a range of heavy metals, oils, pesticides, industrial chemicals, and salts that do harm
18. a large area of the earth that is home to similar plant and animal communities that have adapted over time
19. a lack of sufficient water to meet demands of an area or population
20. a change in global or regional climate patterns

1. a specific place on earth and all the things, both animate and inanimate, that are there
2. Variety of living organisms found in an enviroment
3. the dying out and complete disappearance of a species
5. any substance that is released into the enviroment that causes damage
6. the deterioration of a coastline due to natural or human effects
8. the water of otherwise dry land by artificial means to help in the growing of crops.
9. a plant, animal or other organism that is not native to an area and has a negative affect
10. the transformation of fertile land into relatively dry desert
13. a range of substances that do harm to the enviroment
15. the ongoing decrease in the PH levels of the ocean
17. a complex community made of up living organisms that interact with each other and their enviroment