Look for the Basic Math Symbol!

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Across
  1. 4. exponent
  2. 6. ‰
  3. 8. caret
  4. 9. []
  5. 11. ppb
  6. 13. horizontal line
  7. 14. √
  8. 15. decimal point
  9. 17. minus sign
  10. 18. +
  11. 19. /
Down
  1. 1. ()
  2. 2. multiplication
  3. 3. times sign
  4. 4. ppt
  5. 5. %
  6. 7. ppm
  7. 10. ≈
  8. 12. greater than or equal to
  9. 16. division