Across
- 3. water that percolates through the surface and is retained in underlying rock and soil.
- 6. single celled algae
- 9. the process by which water is released from plans leaves
- 11. living or growing in water
- 13. a colorless, pungent gas composed of nitrogen and hydrogen from animal waste
- 14. the cultivation of aquatic organisms (as fish or shellfish) especially for food; fish farming.
- 15. a hole that is drilled into the aquifer
- 18. chemical substances applied to plants to keep insects away
- 19. an underground water system made of porous rock and sand
- 20. chemicals used to kill weeds
- 21. when water vapor (gaseous water) forms droplets of water in the atmosphere, making clouds. The change in water from gas to liquid form.
Down
- 1. water returning to the surface after being absorbed by the ground
- 2. very small aquatic animals
- 4. water that is released from the atmosphere as rain, snow, hail, etc.
- 5. the process by which plants convert energy from the sun into food
- 7. when precipitation is absorbed into the ground and moves down through the soil
- 8. ability of something to allow liquids to run through it
- 10. A colorless, odorless gas that is a non-metallic element which makes up almost four fifths of the air
- 12. When large amounts of nutrients enter the water and cause an increase in the amount of oxygen
- 16. the change in water from liquid to gas
- 17. a water-soluble molecule made up of nitrogen and oxygen, commonly found in agricultural fertilizers