Across
- 3. Oxygen Oxygen gas which is dissolved in liquid water. Necessary for aquatic (water) organisms to live.
- 4. Toxic chemicals that are found in surface runoff contaminated with fertilizers, septic tank leakage, sewage, and erosion of natural deposits (geological formations).
- 5. Refers to a high level of calcium and magnesium in drinking water.
Down
- 1. Refers to the level of clarity (clearness) or cloudiness of a body of water.
- 2. Toxic chemicals that enter waterways from human and animal waste, laundry, cleaning and industrial effluents (something that flows out).