Environmental Science cross puzzle

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