pacific
Artic
Greenland is mostly covered by an ice sheet.
Yes.
Arctic
Only two landmasses are covered with ice sheets: Antarctica and Greenland. All other land is not so covered. The ice over the Arctic ocean covers open water.
87
By average wave size, the Arctic Ocean, since for most of the year it is covered by pack ice, and the average depth is less around the continents.
Ice
Arctic ocean and Southern ocean
According to Wikipedia, the Arctic Ocean is mostly covered by ice during the northern winter months. It is the smallest and most shallow ocean of the major oceanic divisions. The Southern Ocean, which surrounds the continent of Antarctica, becomes mostly ice in the southern winter, because the continent almost doubles in size when the ocean freezes.
The Arctic Ocean is unique because it is the smallest and shallowest ocean, covered by ice for most of the year. It is also surrounded by landmasses, unlike other oceans which are connected.
No, Greenland is not always covered by ice. It experiences seasonal variation in ice coverage, with the majority of the island covered by ice year-round, but in the summer months, some of the ice does melt.