The Environment

4. The gradual increase in the temperature of the earth’s atmosphere believed to be caused by the greenhouse effect.
9. The introduction of anything to the environment that contaminates it and, in some way, causes it to be spoiled.
10. When species are introduced to an area from another foreign ecosystem.
12. A large open area of country covered with grass, especially one used for grazing.
14. A vast, flat, treeless Artic region of Europe, Asia and North America in which the subsoil is often frozen.
17. A large naturally occurring community of flora and fauna occupying a major habitat.
18. The number and variety of organisms found within a specified geographic region
19. The activity of capturing and killing wild animals or game for food or sport.

1. The activity of catching fish, either for food or as a sport.
2. A large, flat parcel of land with few trees.
3. The action of an element coming forcibly into contact with another.
5. When animal and plant species are killed at a faster rate that the population can be replaced.
6. A large natural elevation of the earth's surface rising abruptly from the surrounding level, or a large steep hill.
7. A forest with heavy annual rainfall.
8. Destroying the environment in which plants and animals live.
11. A dry, barren area of land, typically covered with sand.
13. A group of individual organisms that are capable of interbreeding to produce fertile offspring in nature.
15. The action or process of causing so much damage to something that it no longer exists or cannot be repaired.
16. The natural home or environment of an animal, plant, or other organism.