Across
- 3. A large natural stream of water flowing in a channel to the sea, a lake, or another such stream
- 4. Frozen water
- 7. Makes the noise "meow"
- 8. Natural electrical phenomenon in the sky (reddish or greenish light) usually near the northern or southern magnetic pole
- 9. Decayed organic material used as a plant fertilizer
- 10. Water that has once been used in a home, in a business, or as part of an industrial process
- 13. A tower or other structure containing a beacon light to warn or guide ships at sea
- 15. 97 percent of salt water makes up the world's?
- 16. A building with sails or vanes that turn in the wind and generate power to grind grain into flour
- 19. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
- 20. Is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments
- 21. Any of a group of spore-producing organisms feeding on organic matter, including molds, yeast, mushrooms, and toadstools
Down
- 1. Leakage of petroleum onto the surface of a large body of water
- 2. The cutting down of trees in a large area; the destruction of forests by people.
- 5. Many species of plants and animals are in danger of/threatened with extinction (= being destroyed so that they no longer exist)
- 6. A mountain with a large circular hole at the top through which lava and other substances are forced out
- 11. An animal that is called "man's best friend"
- 12. A luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistently heavy rainfall
- 14. Plant that retains green leaves throughout the year
- 17. A barren area of landscape where little precipitation occurs
- 18. The Titanic hit one of these
- 22. Spring, summer, autumn, and winter