Science Crossword

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Across
  1. 2. outer layer of the earth
  2. 3. The major organ is the heart
  3. 4. discovered sea floor spreading
  4. 6. Discovered continental drift
  5. 13. A substance that takes part in and undergoes change during a reaction
  6. 14. having two different alleles or genes
  7. 15. When two or more atoms join together
  8. 16. only found on continent coast lines
Down
  1. 1. removes waste from the body
  2. 2. made of iron and nickle
  3. 5. processes food by breaking it down
  4. 7. part of the upper mantle
  5. 8. Attached to bones by tendons
  6. 9. having two of the same alleles
  7. 10. the continents seem to fit together like puzzle pieces
  8. 11. A substance produced during a chemical reaction
  9. 12. thickest layer of the earth