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 nilas frozen sea ice drift sea ice model icefloe ice floes sea ice modelling multi year ice ecology of sea ice first year ice sea ice field ice
sea ice
WikipediaEntity
Sea ice