Across
- 3. Describes species that no longer exist.
- 6. Hazardous waste causing danger.
- 8. Natural environments absorbing waste.
- 10. The envelope of gases surrounding the earth
- 11. Part of Earth in which life exists.
- 12. The surroundings in which organisms live.
- 13. another planet.
Down
- 1. Humans are the superior species.
- 2. The natural environment of an organism.
- 4. All the water on earth.
- 5. The variety of life in the world.
- 7. The solid, outer layer of the earth.
- 9. Harmful materials put into the environment.