A polynya is a stretch of open water surrounded by what?
Ecology of sea ice Icefloe Ice floes Sea ice model Multi-year ice Frozen sea First year ice Field ice Ice drift Sea-ice Sea ice modelling Sea Ice Nilas Ice Floe Sea ice
ice floe ice floes sea ice model ecology of sea ice frozen sea icefloe first year ice sea ice sea ice modelling ice drift multi year ice field ice nilas
sea ice
WikipediaEntity
Sea ice