Across
- 2. a continuous cycle in which nitrogen circulates through living organisms and non-living components, including the atmosphere, soil, water, plants, animals, and bacteria
- 5. a chemical or natural substance added to soil or land to increase its fertility
- 9. Process that releases energy by breaking down glucose and other food molecules in the presence of oxygen
- 14. rot or decompose through the action of bacteria and fungi.
- 20. a disturbance that interrupts or causes confusion
- 21. the variety of species found in an environment
- 23. Conversion of light energy from the sun into chemical energy.
- 25. places of carbon accumulation such as in large forests (organic compounds) or ocean sediments (calcium carbonate); carbon is thus removed from the carbon cycle for moderately long to very long periods of time.
- 26. a relationship where one organism (hunter) hunts and kills another (prey) for food
- 27. the process of burning something
- 29. a symbiotic relationship where both organisms benefit
- 31. illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web
- 33. process by which bacteria convert nitrates into nitrogen gas
- 34. A process by which nutrients, particularly phosphorus and nitrogen, become highly concentrated in a body of water, leading to increased growth of organisms such as algae or cyanobacteria.
Down
- 1. Green pigment in plants that absorbs light energy used to carry out photosynthesis
- 3. a symbiotic relationship where one organism (parasite) benefits by harming the other (host)
- 4. an event, caused by physical, chemical, or biological agents, resulting in changes in population size or community composition
- 6. The removal of trees faster than forests can replace themselves.
- 7. a relationship where organisms compete for limited resources
- 8. Process of converting nitrogen gas into ammonia
- 10. the ability of an ecosystem to maintain balance and return to equilibrium after a disturbance
- 11. the process by which nitrites and nitrates are produced by bacteria in the soil
- 12. An organism that breaks down wastes and dead organisms
- 13. The relationship between two species that live in close association with each other
- 15. Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water.
- 16. Building blocks of protein
- 17. a continuous cycle in which carbon moves through the atmosphere, living organisms, oceans, and soil, shifting between inorganic and organic forms
- 18. the state or process of rotting; decay.
- 19. network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem
- 22. Each step in a food chain or food web
- 24. air pollution by a mixture of smoke and fog
- 28. a symbiotic relationship where one organism benefits but the other is unaffected
- 30. Movement of people from rural areas to cities
- 32. A complex molecule containing the genetic information that makes up the chromosomes.