science

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Across
  1. 8. the ability or tendency to float in water or air or some other fluid.
  2. 9. decay
  3. 12. the quality of being intense or extreme
  4. 14. a substance that increases
  5. 15. the degree of compactness of a substance
  6. 16. something you get on while skiing
  7. 17. the best school ever
  8. 18. liquid
  9. 19. (of a reaction or process) accompanied by or requiring the absorption of heat
Down
  1. 1. a substance that takes part in and undergoes change during a reaction
  2. 2. female royalty
  3. 3. the combination to forma theory or system
  4. 4. animal that digs underground
  5. 5. male ruler
  6. 6. a multiplier that measures some property
  7. 7. something you buy
  8. 9. not alone
  9. 10. accompanied by the release of heat
  10. 11. math problem that has equal sign
  11. 13. alone
  12. 17. greatly impress or amuse