Across
- 3. area of land that is drained by a river
- 5. ability of rock or soil to allow water to flow through it
- 8. excess richness of nutrients in a body of water
- 10. flowing network of water
- 11. underground formation that contains groundwater
- 14. when the temperature of a body of water increases
- 17. pollution that comes from many different sources that are difficult to identify
- 19. water that contains waste from homes or industry
- 20. pollution discharged from a single source
Down
- 1. process of removing salt from salt water
- 2. freshwater on earth’s surface
- 4. buildup of pollutants at higher levels of the food chain
- 6. artificial lake formed behind a dam
- 7. percentage of the total volume of a rock that has spaces/pores
- 9. area of the earth’s surface from which water percolates down into an aquifer
- 12. structure built across a river to control the river’s flow
- 13. organisms that cause illness or disease
- 15. water beneath the earth’s surface in sediment and rock formations
- 16. describes water that is safe to drink
- 18. introduction of chemical, physical, or biological agents into water that degrade water quality and adversely affect organisms that depend on the water