Across
- 3. the number and types of plants and animals that exist in a particular area or in the world
- 4. a long period when there is little or no rain
- 5. all the living things in an area and the way they affect each other and the environment
- 7. to make something less pure or make it poisonous
- 9. a poisonous substance
- 11. the natural world, as a whole or in a particular geographical area, especially as affected by human activity
- 13. causing little or no damage to the environment and therefore able to continue for a long time
- 14. the weakening or damage done to something by a series of gradual losses of parts of it
Down
- 1. natural environment of an organism, the type of place in which it is natural for it to live and grow
- 2. permanent removal of trees to make room for something besides forest
- 6. an amount of a substance that is produced and sent out into the air that is harmful to the environment
- 8. the weather conditions prevailing in an area in general or over a long period.
- 10. damage caused to water, air, etc. by harmful substances or waste
- 12. unwanted matter or material of any type, especially what is left after useful substances or parts have been removed