Environmental Science

4. All the water found on Earth.
7. Sphere where all living organisms exist.
10. The second most abundant element in organisms by mass.
11. Water falling from clouds to Earth.
12. OF ENERGY Law stating that energy cannot be created or destroyed, only transformed.
16. Solid outer layer of Earth.
17. Excessive growth of algae caused by nutrient enrichment.
19. Process where plants release water vapor into the atmosphere.
21. The first step of the scientific method.
22. SCIENCE Scientific study of interactions between living organisms and their environment.
24. The ability to do work.
26. Organized body of knowledge gained through observation and experimentation.
28. Process that converts nitrates back into nitrogen gas.
30. Study of relationships between organisms and their environment.

1. Layer of gases surrounding Earth.
2. COMMONER Founder of modern ecology.
3. Process where water vapor forms clouds.
5. Process where plants convert carbon dioxide into food.
6. Non-living components of an ecosystem.
8. CYCLES Natural pathways that recycle essential elements through the environment.
9. RAIN Rain made acidic by sulfur dioxide.
13. Gas released by plants during photosynthesis.
14. Process that changes liquid water into water vapor.
15. SEGREGATION Separation of waste into different categories.
18. TIDE Common name for a harmful algal bloom.
20. Practice of converting waste into useful materials.
23. Gas that makes up about 78% of Earth's atmosphere.
25. A testable explanation for an observation.
27. FIXATION Process of converting nitrogen gas into ammonia.
29. Living components of an ecosystem.