Puzzle 3

3. A large, powerful ape found in the forests of central Africa.
4. Moving air, especially when it moves strongly or quickly.
9. The native animals and plants of a region.
10. The production and discharge of something, especially gas or radiation.
11. A large marine mammal with a streamlined body.
12. The ability to be maintained at a certain rate or level, especially without depleting natural resources.
13. The preservation, protection, or restoration of the natural environment and wildlife.
14. Organic material used as fuel to produce energy.

1. A large natural elevation of the earth's surface rising abruptly from the surrounding level.
2. The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.
5. Unwanted or harmful sound that can disrupt the environment.
6. A structure with walls and a roof made chiefly of transparent material, in which plants requiring regulated climatic conditions are grown.
7. A large open area of country covered with grass.
8. Not harmful to the environment.