You searched for: “floe
floe, flow, flux
floe (FLOH) (noun)
A flat mass of floating ice: A floe was making the ship's progress quite difficult.
flow (FLOW) (verb)
To move smoothly, as in a stream: Jaclyn turned on the bathtub faucet and the water started to flow.
flux (FLUKS) (noun)
1. Constant change and instability: Greg's political views are in a state of flux.
2. A state of uncertainty about what should be done, usually following some important event, preceding the establishment of a new direction of action: The flux following the death of the king caused much concern among the politicians.

The frequent flux in the weather patterns often causes an ice floe to flow down the river towards the sea.