Brainy Quest: A Fun Student Crossword Challenge

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Across
  1. 2. The study of past events. (7 letters)
  2. 5. Scale A tool used to measure weight. (5 letters)
  3. 7. The process of making food in plants. (13 letters)
  4. 8. The smallest continent by area. (9 letters)
  5. 9. A gas that makes up 78% of the air. (8 letters)
  6. 10. The study of living organisms. (7 letters)
  7. 13. The deepest part of the ocean. (5 letters)
  8. 14. Sun The main source of energy for Earth. (3 letters)
  9. 15. A liquid metal used in thermometers. (7 letters)
  10. 17. The part of the plant that absorbs water. (4 letters)
  11. 18. The process plants use to make food. (13 letters)
Down
  1. 1. The branch of science dealing with stars and planets. (10 letters)
  2. 3. The largest planet in our solar system. (7 letters)
  3. 4. The study of numbers and shapes. (11 letters)
  4. 6. The capital city of Kenya. (7 letters)
  5. 10. The largest mammal on Earth. (4 letters)
  6. 11. The organ responsible for pumping blood. (5 letters)
  7. 12. A shape with four equal sides and angles. (6 letters)
  8. 14. The smallest particle of an element. (4 letters)
  9. 16. The chemical symbol for water. (2 letters)