Andres crossword puzzle

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Across
  1. 2. the opposite of addition
  2. 4. the half of a final
  3. 6. to exchange something
  4. 9. the study of something or another name for electronics
  5. 11. something that can be carried or to help
  6. 14. it is something that singers use
  7. 15. a writing to send to someone far away
Down
  1. 1. something magical
  2. 3. to break something
  3. 5. what volcanos do
  4. 7. a "wow" moment
  5. 8. to get a physical reaction to something (like pollen)
  6. 10. the opposite of impossible
  7. 12. to get someone's signature
  8. 13. another word for happy