The Knowledge Puzzle: A Student's Trivia Adventure

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Across
  1. 3. The body system responsible for movement. (8 letters)
  2. 4. The gas we breathe in to survive. (6 letters)
  3. 5. The chemical symbol for gold. (2 letters)
  4. 7. The study of plants. (8 letters)
  5. 9. A shape with no corners or edges. (5 letters)
  6. 10. The chemical symbol for water. (2 letters)
  7. 12. The process by which water turns into vapor. (11 letters)
  8. 13. The green pigment in plants. (11 letters)
  9. 15. The study of living organisms. (7 letters)
  10. 16. The largest ocean on Earth. (7 letters)
  11. 17. The organ responsible for pumping blood. (5 letters)
  12. 18. The freezing point of water in Celsius. (5 letters)
Down
  1. 1. The deepest part of the ocean. (5 letters)
  2. 2. The natural satellite of Earth. (4 letters)
  3. 4. The process by which plants make food. (13 letters)
  4. 6. A tool used to measure weight. (5 letters)
  5. 8. The study of past events. (7 letters)
  6. 11. The smallest particle of an element. (4 letters)
  7. 12. A gas that makes up 78% of the air. (8 letters)
  8. 14. The largest planet in our solar system. (7 letters)