Across
- 3. Bacteria that are always present in the digestive tracts of animals, including humans, and are found in their wastes. They are also found in plant and soil material.
- 4. The draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.:
- 5. A measure of water clarity how much the material suspended in water decreases the passage of light through the water. Suspended materials include soil particles (clay, silt, and sand), algae, plankton, microbes, and other substances.
- 7. Enter waterways from human and animal waste, phosphorus rich bedrock, laundry, cleaning, industrial effluents, and fertilizer runoff
- 8. A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
Down
- 1. An area or ridge of land that separates waters flowing to different rivers, basins, or seas.
- 2. A substance that does not allow fluid to pass through.
- 6. Occurs naturally in mineral deposits, soils, seawater, freshwater systems, the atmosphere, and biota. More stable form of combined nitrogen in oxygenated water. Found in the highest levels in groundwater under extensively developed areas. Enters the environment from fertilizer, feedlots, and sewage.
- 7. The measure of the acidity or alkalinity of a solution. A measurement of the concentration of hydrogen ions in a solution.