Extreme sports

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Across
  1. 2. when you go to the top of a mountain, the easier way
  2. 5. to visit hollow Earth structures
  3. 8. when somebody fears something, they are ...
  4. 10. to travel through air only with a parachute
  5. 11. the feeling a person has when they are scared
  6. 12. to climb indoors
Down
  1. 1. to get up/down a mountain using a rope¨
  2. 3. to go through something
  3. 4. when something happens in unwanted manner, might end up in an injury
  4. 6. to walk a rope high above the ground
  5. 7. adjective describing activity as not safe
  6. 9. when you go to the top of a mountain, the difficult way