Extreme sport

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Across
  1. 2. the activity or sport of moving over snow using a snowboard
  2. 4. the activity of leaping from a high place while secured by a long nylon-cased rubber band around the ankles
  3. 5. the sport or activity of swimming underwater using a scuba
  4. 8. a sport in which a person jumps from an aircraft and falls for as long as possible before opening a parachute
Down
  1. 1. A motor sport in which powerful trucks, without their containers, are raced around a circuit
  2. 3. the sport or activity of riding a mountain bike
  3. 6. an activity in which people move quickly around buildings and objects in a city while performing jumps and other skillful movements
  4. 7. a sport in which you sail across water by standing on a board and holding onto a large sail