Across
- 4. variable, the variable that is purposely changed (Cause).
- 8. cycle, the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.
- 11. accumulation of pollutants at successive levels of the food chain
- 12. cycle, the series of processes that change one type of rock into another type of rock.
- 14. effect, that results when solar radiation is trapped by the atmosphere
- 15. resources, there are only certain amounts of resources (food, water, space).
- 16. rocks, rocks formed when other rocks are put under extreme heat and pressure.
- 17. a series of predictable and orderly changes within an ecosystem over time.
- 19. a community of organisms and their abiotic environment
- 21. gases, gases in the atmosphere that trap energy
- 22. first
- 24. renewable, a resource that cannot be reused or replaced easily (ex. gems, iron, copper, fossil fuels)
- 25. analysis, a study that compares the costs and benefits to society of providing a public good
Down
- 1. proof.
- 2. the build up of a substance (usually a toxin) as it passes through a food chain
- 3. wear away or change the appearance or texture of (something) by long exposure to the air.
- 5. release of harmful materials into the environment
- 6. ability to keep in existence or maintain. A sustainable ecosystem is one that can be maintained.
- 7. variable, the variable that changes as a result of changing the independent variable(Effect).
- 9. all the water on earth
- 10. cycle, the movement of carbon from the nonliving environment into living things and back
- 13. the second-lowest layer of Earth's atmosphere.
- 18. an organism that eats other organisms
- 20. community, a stable community that no longer goes through major ecological changes
- 23. a thin layer of gases surrounding Earth.