Ответ:

1. Volcano surfing is the latest extreme sports craze.

2. The young quad racing competitor failed to show up for the event.

3. River buggers speed along a river and down rapids.

4. He drove his ice ax deep into the side of the snow-covered mountain.

5. A large group of divers took their ironing boards underwater to set a world record.

6. Ice climbing up a steep slope is quite challenging.

7. Without webbed gloves, it is difficult to control your river bug.