Across
- 2. Essential element found in cysteine
- 3. Study of weather and the atmosphere
- 7. Natural process of converting biodegradable waste into fertilizer
- 9. Process that converts carbon dioxide into organic carbon
- 11. A testable explanation for an observation
- 13. First step in the scientific method
- 14. Study of interactions between organisms and their environment
- 16. Part of Earth where life exists
- 17. Everything that affects an organism during its lifetime
- 19. Place where elements are stored in a cycle
- 21. All water found on Earth
- 24. All organisms living in one area
- 26. Biologically important inorganic form of phosphorus
- 27. Movement of water through plants
- 29. Organized body of knowledge obtained through study and experimentation
Down
- 1. Water stored beneath Earth's surface
- 4. Process where liquid water becomes water vapor
- 5. )
- 6. Outer solid layer of Earth
- 8. Group of the same species living in one area
- 10. Protective blanket of gases surrounding Earth
- 12. Corrosive rain caused by sulfur dioxide
- 15. Study of species distribution
- 17. Living and nonliving components interacting together
- 18. Conversion of nitrates into nitrogen gas
- 20. Widely accepted explanation of natural phenomena
- 22. Excessive algal growth caused by nutrient pollution
- 23. Measure of disorder in a system
- 25. Founder of the Four Laws of Ecology
- 28. Makes up about 78 percent of Earth's atmosphere
- 30. Second most abundant element in living organisms