Yet another crossword puzzle

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Across
  1. 3. A person who studies caves as a hobby
  2. 5. Move stealthily when hunting, wild cats in search of prey
  3. 6. Burn these logs to provide consistant heat and low flame ( wood & tree)
  4. 9. A typical game played by school kids with chestnuts on strings (Great Britain & Ireland)
  5. 11. stomach , head , ear and back pain
  6. 12. Keep me informed please
  7. 15. A boat with two hulls
  8. 17. The very thing we breathe
  9. 18. A bear native to North America
Down
  1. 1. A really cool sweatshirt that covers the head
  2. 2. You play this when you skip school
  3. 3. You need one of these garden tools if you want to dig a hole
  4. 4. That type of 1 up 1 down beds
  5. 7. Give your best ones at the end of your e-mails
  6. 8. A kitchen utensil...a soup scoop!
  7. 10. Washing machines use centrifugal force cycle
  8. 13. You've got to be on this or you'll be late
  9. 14. Connect your new device for the first time via bluetooth
  10. 16. It could be a .... disaster or even a sergeant...