Brain Boost Crossword: Explore and Educate

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Across
  1. 5. A polygon with three sides. (8 letters)
  2. 7. A tool used to measure weight. (5 letters)
  3. 9. Heart The organ responsible for pumping blood. (5 letters)
  4. 11. A period of ten years. (5 letters)
  5. 12. The planet known as the "Red Planet." (4 letters)
  6. 13. The main source of energy for Earth. (3 letters)
  7. 14. The gas we breathe in to survive. (6 letters)
  8. 15. The layer of air around Earth. (9 letters)
  9. 16. The study of living organisms. (7 letters)
  10. 17. Nairobi The capital city of Kenya. (7 letters)
  11. 19. The smallest continent by area. (9 letters)
Down
  1. 1. The green pigment in plants. (11 letters)
  2. 2. The hardest natural substance. (7 letters)
  3. 3. The freezing point of water in Celsius. (5 letters)
  4. 4. A shape with four equal sides and angles. (6 letters)
  5. 6. A famous physicist who developed the theory of relativity. (8 letters)
  6. 8. The fourth planet from the Sun. (4 letters)
  7. 10. The branch of science dealing with stars and planets. (10 letters)
  8. 16. The study of numbers and shapes. (11 letters)
  9. 18. The chemical symbol for water. (2 letters)