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Across 1. Eroded soil particles that wash or blow into rivers 3. All the land drained by a river, stream or lake 5. Animal that lacks a backbone and is visible to the naked eye 6. Discharge entering a stream at a specific detectable point such as a pipe or outfall 8. Surplus water from rain and melted snow 10. Rapid, dense growth of algae that robs the water of oxygen as it dies an decomposes 12. A natural system linked by living and nonliving things 13. Drainage area of a river 14. Pertaining to the edges of streams 15. The water found in cracks and pores in sand, gravel, and rocks below the earth’s surface

Down 2. Diffuse runoff from large areas of land 4. The amount of land and water needed to support one’s lifestyle using current technology 7. A semi-enclosed area where fresh water from a river meets salt water from the sea 9. Open space or connector along a natural corridor used for parks and trails 11. A porous rock layer underground that is a reservoir for water