Science Crossword

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Across
  1. 2. Center of an atom
  2. 5. The powerhouse of a cell
  3. 7. Smallest type of cell that can only be seen with a powerful microscope
  4. 9. The change from solid to liquid
  5. 11. Liquid that is liquid at room temperature
  6. 12. Hardest natural substance
  7. 15. Force that pulls us to Earth
  8. 16. Liquid with chemical symbol H2O
Down
  1. 1. Device used for measuring temperature
  2. 3. The basic unit of life
  3. 4. Biggest planet in our solar system
  4. 5. Planet known as the Red Planet
  5. 6. Chemical symbol for gold
  6. 8. What is the transfer of energy involving volume (how loud it is)?
  7. 9. Planet closest to the sun
  8. 10. Something lacking light and having a high gravitational pull
  9. 13. What do plants release during photosynthesis?
  10. 14. Energy from the sun