Across
- 6. area of Earth's surface where water percolates down into an aquifer
- 7. flowing network of water formed by streams and rivers
- 11. level where rocks and soil are saturated with water
- 12. percentage of the total volume of rock that has spaces
- 13. area of land drained by a river
- 15. safe to drink
- 17. process of removing salt from water
Down
- 1. systems of pipes and tunnels that brought water from the mountains
- 2. water found beneath Earth's surface in the spaces in sediment and rock
- 3. underground formation containing groundwater
- 4. ability of rock or soil to allow water to flow through
- 5. fresh water on Earth's land surface
- 6. artificial lake formed behind the dam
- 8. when lakes and slow moving streams contain an abundance of nutrients
- 9. method of providing plants with water sources other than direct precipitation
- 10. hole that is dug or drilled to reach groundwater
- 14. organisms causes disease or illness
- 16. built across rivers to control the river's flow