Across
- 3. fresh water fish, most common in lake erie.
- 5. natural solid mass or aggregate of minerals or minerloid matter.
- 8. introduction of harmful materials into the environment.
- 9. small single celled organisms. Almost found everywhere on Earth, and are vital to a planets ecosystems.
- 11. small, narrow valley which usually has running water.
Down
- 1. very steep rock face or cliff.
- 2. wood: efficient wood to burn with, unique grain pattern
- 4. Species of freshwater fish belonging to the genera oncorhynchus, salmo, and salvelinus.
- 5. arch of colors in sky caused by refraction of light
- 6. nonflowering, aquatic plant of a large group, seaweeds.
- 7. body of water, usually freshwater.
- 9. small vessel propelled on water by engines or sails.
- 10. perennial plant with an elongated stem