Very difficult

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Across
  1. 7. two wheeled vehicle used for motocross
  2. 8. used to protect the eyes
  3. 10. sed to protect the knees
  4. 11. used to protect hands
  5. 13. sport in which a suit is used to fly
  6. 14. second part of the body that suffers more fractures
  7. 15. where people sit to watch some sports
Down
  1. 1. extreme sport where you skate on snow
  2. 2. wound where bones break
  3. 3. used to climb somewhere
  4. 4. used to protect feet from snow
  5. 5. where are some water sports done
  6. 6. mass of a person
  7. 9. It is used in ramplas where some acrobatics are done on it.
  8. 12. free fall with parachute