Across
- 4. rainfall that flows over the ground surface
- 8. an identifiable source of air, water, thermal, noise or light pollution
- 9. a hole drilled into the ground to access water contained in an aquifer
- 10. water found underground
- 12. they damage the quality of air, water, and land
Down
- 1. the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity
- 2. the preservation, control and development of water resources
- 3. water that collects on the surface of the ground
- 5. the contamination of water or air that does not originate from a single discrete source
- 6. an area of land that drains all the streams and rainfall to a common outlet
- 7. the introduction of harmful materials into the environment
- 8. water that is safe to drink or use for food
- 11. a body of porous rock or sediment saturated with groundwater