By Its Buoyance.
prone float, supine float,
jack hammer float
Float...
No they do not float they sink right to the bottom so if I was you I wouldn't use them to go swimming with.
A cork has a low density. It is lower then water. That causes it to float.
It is when you float face down without any movement of the arms or legs.
floaty float
Yes
A supine float is floating in the water on your back with head above water.
You float face down in the water. You only move to get air.
So you don't sink.