Extreme sports

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Across
  1. 5. improve for a person in something and it will serve him or her
  2. 7. group of people working on a job in factors of various activities
  3. 10. is required to perform the activities
  4. 12. move from one place to another for a certain period of time in order to learn about
  5. 13. has performed activities and is qualified to do so
  6. 14. knowledge or moments that are acquired in life
Down
  1. 1. price decreasing for something special
  2. 2. not remember something
  3. 3. proves that it is efficient
  4. 4. The place you go to do skydiving
  5. 6. total confidence in something
  6. 8. issued by the government that is used to validate certain government documents
  7. 9. people who are born and live more or less at the same time, collectively
  8. 11. It's an object to protect the head
  9. 15. that can be dangerous and fun