What keeps a hovercraft up?

Related questions

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5. What boats were used in D Day?
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Tags

1. #curtain
2. #create
3. #surrounding
4. #called
5. #beneath
6. #these
7. #water
8. #trapped
9. #keeping
10. #vehicle
11. #traps
12. #surface
13. #flexible
14. #pushed
15. #hovercraft
16. #which
17. #currents
18. #smooth
19. #underneath
20. #cushion
21. #skirt