If there was a justifiable reason that a given medium supported a given movement, I don't see why not.irdeggman said:Be careful with this one it will lead to the following non-magical means of movement application:
Burrowing underwater.
Burrowing through air.
Climbing underwater (not on a ladder).
Climbing through air.
Walking in air.
The logic is exactly the same - applying movement in other mediums.
Example: you could burrow through water filled tunnels (or ice, snow, jello, etc.) rather than just dirt. We've already established you can walk through (or on) air or water if supported somehow. Climbing is for walls or slopes, but it could still be used on say, a ceiling or floor in the right circumstances. A swimmer could move through things other than water (ale?), and I'd even allow it (assuming they were bouyant) in suitably thick air. A ghost's flying speed is evidently suitable for ground movement or moving through earth, etc.