Science Week 2021

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Across
  1. 5. Smallest bone in human body (6)
  2. 6. Evidence based on experience (7)
  3. 9. Alloy of copper and tin (6)
  4. 11. Stellar explosion (9)
  5. 12. North-South lines of Earth's surface (8)
  6. 14. Animals that are active during twilight (11)
  7. 16. Used by astronomers to study stars and planets (9)
  8. 18. Only person to win Nobel Prize in two scientific fields (5-5)
  9. 20. A push or a pull (5)
  10. 21. Acid and base react to create this and water (4)
Down
  1. 1. A prediction of what will happen in an experiment (10)
  2. 2. Fluid's ability to resist flowing (9)
  3. 3. 20th Element of the Periodic Table (7)
  4. 4. Type of variable that is measured (9)
  5. 7. The layer of skin on the outside of the body (9)
  6. 8. Changing direction of light through a lens (10)
  7. 9. Allows an object to float on water (8)
  8. 10. Turn liquid to solid (6)
  9. 13. First part of any food chain (8)
  10. 15. Fall out of (10)
  11. 17. Plantae is one of these (7)
  12. 18. Its two satellites are named Phobos and Deimos (4)
  13. 19. An object's resistance to change in motion (7)