Across
- 2. lightly salty water
- 4. spread of human infrastructure
- 6. free of oxygen
- 9. off-season vegetation planted over fields and plowed to decompose for the main crop
- 10. living factors
- 11. organisms that can produce their own food, using materials from inorganic sources
- 15. regular pattern of variations in water levels
- 17. planting different crops in an area each year
- 18. spongey substance formed by partially decomposed vegetation
- 19. structures used to stop water from naturally changing course
- 20. used to control weeds and aerate soil
Down
- 1. water-retention of soil
- 3. wetlands with woody plants
- 5. permanently or seasonally saturated with water
- 7. area which has hydric and anerobic soil and supports a plant community which is adapted to living in these soils
- 8. coming from a clearly identified source
- 12. wetlands filled with peat and acidic water
- 13. barriers which restrict water flow
- 14. non living factors
- 16. wetland with frequent flooding or constant surface water