Logarithms

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Across
  1. 4. 1000
  2. 5. long-term .....
  3. 8. this crossword title
  4. 10. the Ph.... goes from 1 to 14
  5. 11. the most .... logarithm
  6. 14. dB
  7. 15. the scale connected with earthquake
Down
  1. 1. nationality of Joost Burgi
  2. 2. square ....
  3. 3. sound.......
  4. 6. the .... of an earthquake
  5. 7. how acidic or ... something is
  6. 8. .....music
  7. 9. more .... numbers
  8. 12. Scottish mathematician
  9. 13. the most common logarithm base