Across
- 2. Underground layers of premeable rock, sand, or gravel
- 4. The process of making something dirty or poisonuos
- 6. Natural streams of freshwater flowing in a channel
- 7. A large, inland body of still water
Down
- 1. Fresh water held underground in soil pore spaces and rock fractures
- 3. A liquid
- 5. The vast interconnected saltwater bodies covering 71% of earth