Science & Nature 1

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Across
  1. 2. What is the name of the world's first artificial satellite?
  2. 4. What is the chemical element with the symbol Fe?
  3. 7. What is the process by which plants convert sunlight to energy?
  4. 9. What is the process by which a liquid changes into a gas?
  5. 12. Where is the strongest human muscle located?
  6. 14. Optics is the studying of what?
  7. 15. What scientific theory proposed that Earth revolves around the sun?
  8. 17. What is the scientific theory that explains the origin of the universe?
  9. 18. Which is the only body part that is fully grown from birth?
  10. 19. Which planet in the Milky Way is the hottest?
Down
  1. 1. What are the bones in the ear collectively known as?
  2. 3. What is the outermost layer of the Earth’s atmosphere called?
  3. 5. Who discovered that the Earth revolves around the sun? Answer:
  4. 6. What metal is combined with Zinc to make Brass?
  5. 8. Which planet has the most moons?
  6. 10. Which is the most abundant gas in the Earth's atmosphere?
  7. 11. What are there 118 of in the periodic table?
  8. 13. What is the smallest unit of matter?
  9. 14. Which is the lightest metal in the periodic table?
  10. 16. Which planet is closest to the sun? Answer: