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Across 3. Relatively pure water; water with few dissolved salts. 5. Water that flows over land and collects in a stream or river. 6. A channel dug into an aquifer to reach groundwater. 9. An area where surface water soaks into the ground and reaches an aquifer. 10. A spongelike formation of rock, sand, or gravel that holds water. 11. The boundary between the zone of aeration and the zone of saturation in an aquifer. 12. Not allowing water or other substances to pass through.

Down 1. Fresh water found below Earth's surface. 2. Having spaces or pores that allow water or other substances to pass through. 4. Fresh water found on Earth's surface. 7. A network of connected streams and rivers. 8. All of the land area that supplies water to a particular river system.