Tea weed
You could call it homogeneous. If the salt is dissolved into the water, then I would call it a solution.
The Floating Call - 1914 was released on: USA: 14 November 1914
When a solvent and solute are combined, they form a mixture known as a solution. The solute dissolves in the solvent, leading to a homogenous mixture with uniform composition throughout.
Floating wreckage is often referred to as flotsam and jetsam.
birling
wrack
That is called hovering.
An atoll is an island that encircles a lagoon. The floating cities in the film are like that.
a cloud
Lesboats
It is called 'floating' the horse's teeth.