Quote Originally Posted by DarthEnder
I don't see how bubbles are any less elemental than sand. If anything it's a pretty obvious water jutsu.
I have never seen any "natural" water form bubbles that will float in the air.

All my "natural" water bubbles stay in the water. In the case of rapids, they kind of float on top, but never leave it.

I would agree that a bubbly water gun jutsu would be an obvious water jutsu, but that would just decrease the density of the medium, and lessen the concussive force on impact.