Environmental Science

3. Scientific study of interactions between living organisms and their environment.
8. Process that changes liquid water into water vapor.
9. Layer of gases surrounding Earth.
10. Natural pathways that recycle essential elements through the environment.
14. Process where water vapor forms clouds.
15. Non-living components of an ecosystem.
16. Water falling from clouds to Earth.
17. Solid outer layer of Earth.
18. Process where plants convert carbon dioxide into food.
19. Excessive growth of algae caused by nutrient enrichment.
23. All the water found on Earth.
27. The first step of the scientific method.
30. Process of converting nitrogen gas into ammonia.

1. The ability to do work.
2. Sphere where all living organisms exist.
4. Gas released by plants during photosynthesis.
5. Process that converts nitrates back into nitrogen gas.
6. Rain made acidic by sulfur dioxide.
7. Living components of an ecosystem.
11. Law stating that energy cannot be created or destroyed, only transformed.
12. Organized body of knowledge gained through observation and experimentation.
13. Gas that makes up about 78% of Earth's atmosphere.
20. A testable explanation for an observation.
21. Common name for a harmful algal bloom.
22. Process where plants release water vapor into the atmosphere.
24. Separation of waste into different categories.
25. The second most abundant element in organisms by mass.
26. Founder of modern ecology.
28. Practice of converting waste into useful materials.
29. Study of relationships between organisms and their environment.