Puzzle C

2. A place where water is stored underground
6. The process by which fertile land becomes desert
11. An item attached to smokestacks to reduce atmospheric emissions
14. The range of conditions in which an organism can survive (2 words)
15. A disease caused from bacteria-infected drinking water
17. The process of bringing up nutrient rich water from the bottom of the ocean
18. The relative abundance of organisms in a given ecosystem
19. A measure of the cloudiness of water

1. Precipitation that can alter the pH of the soil (2 words)
3. Species that are non-native to a region
4. A test used to determine the LD50 of a substance (2 words)
5. A measure of photosynthesis (2 words)
7. Nonrenewable energy sources derived from partially decayed organic matter (2 words)
8. The spinning of surface water in the ocean as determined by the coriolis effect
9. The layer of the atmosphere that contains the ozone layer
10. A fuel type derived from the splitting of water molecules
12. A living component in an ecosystem
13. A more sustainable method of harvesting wood (2 words)
16. Plants that fix nitrogen into the soil
20. Fish or organisms caught accidentally during fishing