Across
- 1. hard part of earth's surface
- 7. process where extra nutrients lead to an increase in producers
- 8. a species that does not originate in the area or region
- 10. farming method where crops are left to decompose on ground
- 12. gradual buildup of a substance in an organism's body
- 13. increase in pesticide concentration as it moves up trophic levels
- 14. process of converting nitrogen gas into ammonium ions
- 15. when species are conserved in their natural habitats
- 16. pollution that occurs at a specific place from an identifiable source
- 17. soil layer where plants get the most nutrients
- 19. decaying plant & animal matter
- 21. an estimate of how much land & water is needed to support your lifestyle
- 24. any organism that causes illness or harm & annoys humans
- 25. non-living parts of an ecosystem
Down
- 2. the function of a species (e.g. habitat, prey, predators)
- 3. type of competition between organisms of the same species
- 4. bacteria type that changes nitrates into nitrogen gas
- 5. group of organisms that belong to the same species
- 6. process where plants or fungi are used to break down or absorb toxins
- 9. step-by-step feeding sequence of organisms
- 11. the maximum # of organisms that ecosystem can sustain
- 13. measures how much oxygen is used by organisms
- 18. process that converts carbon dioxide into sugar
- 20. relationship where both species benefits
- 21. system where groups of organisms interact with their environment
- 22. type of soil that sticks together;no air & water can get in
- 23. evaporation of water from plant