Across
- 5. That part of the precipitation, snow melt, or irrigation water that appears in uncontrolled
- 7. A man-made substance covering natural land
- 9. A molecule that all living creatures need
Down
- 1. enters waterways from human and animal waste,
- 2. Occurs naturally in the environment from soils and plants
- 3. Caused by the presence of suspended matter such as clay
- 4. is a precipitation collector
- 6. Occurs naturally in mineral deposits, and soil, ect.
- 8. Represented on a scale of 0-14 where 0 is the most acidic, 14 is the most alkaline, and 7 is neutral.