Crossword Puzzle

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Across
  1. 1. – Organic compound with enzymes and muscles
  2. 7. – Type of cycle recycling matter
  3. 8. – Reaction that breaks down molecules
  4. 10. – Water vapor becomes liquid
  5. 11. – Acid-base indicator color for acids
  6. 13. – Gas released during respiration
  7. 14. – Movement of rock or soil by water or wind
  8. 15. – All water on Earth
  9. 16. – Scientific investigation process
  10. 17. – Type of fuel made from ancient life
  11. 19. – Substance with pH below 7
  12. 21. – Algae bloom from too much nutrient
  13. 24. – Type of reaction involving bonding
  14. 25. – Capacity to do work
  15. 27. – Ultimate source of energy on Earth
  16. 28. – Stored form of energy
  17. 29. – Element essential to all living things
Down
  1. 2. – Element needed for proteins
  2. 3. – Element in DNA and bones
  3. 4. – Plants use sunlight to make food
  4. 5. – Layer of gases surrounding Earth
  5. 6. – Universal solvent, essential to life
  6. 9. – Outer layer of solid Earth
  7. 12. – Study of organisms and environment
  8. 13. – Sugars and starches (energy source)
  9. 18. – A group of tissues working together
  10. 20. – Energy that travels as waves
  11. 22. – Type of energy from heat
  12. 23. – Starting substance in chemical reactions
  13. 26. – Energy-carrying molecule of cells