Nathan's puzzle

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Across
  1. 2. A kind of table used in chemistry.
  2. 3. A system of measuring most of the world uses.
  3. 5. A longer name for metal
  4. 8. The longer word for gene
  5. 11. The longer word for explore
  6. 12. The opposite of multiply.
  7. 13. This is where sick people can go to get better.
Down
  1. 1. The opposite of multiplication.
  2. 4. To travel through unfamiliar territory
  3. 5. A hard and shiny material
  4. 6. Three feet is a ______________
  5. 7. To host someone at your house
  6. 9. Something you are born with- like your DNA
  7. 10. The punctuation mark that means to stop.