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