Unit 1 Topic 5-7 Crossword

2. the cycle that circulates carbon around ecosystems
3. the process where a liquid changes into water vapour
5. a species that helps monitor the health of an ecosystem
7. a type of pest control using a pest's natural enemies
8. water that runs off the ground into lakes, rivers, or streams
11. when pollutants enter a food chain and collect at the top
13. the continuous movement of water through an ecosystem
15. a substance in the environment that cannot be broken down, stored, or recycled
17. rain the occurs when pollution is in high levels in the air
19. a species brought into an ecosystem by accident
20. a part of the carbon cycle
22. the process where water vapour changes to a liquid
23. ecosystem ____________ means checking the condition of an ecosystem

1. the process where water condenses and falls as rain, sleet, snow, and hail
4. the type of succession that happens in an area that was previously bare like rock
6. the process where plants make their own food using sunlight
9. water in the soil
10. the breaking down of dead matter
12. the gradual process when some species replace others in an ecosystem
14. the process in which water evaporates from an organism
16. the scientific term for a species that has very low population numbers
18. the type of succession that happens in an area that previously had organisms
21. when an organism no longer exists anywhere in the world