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Iceberg or an ice sheet
You are probably thinking of an Iceberg, which can be a very large piece of floating ice.
The North Pole is nothing more than a thick sheet of floating sea ice, there is no land.
Mass affects the density of a object which therefore affects the floating and sinking of it
The North Pole has no land mass under the ice, as it is located in the Arctic Ocean and is covered entirely by sea ice. In contrast, the South Pole is located on the continent of Antarctica, which has a land mass covered by ice.
mass of a substance is constant at any place in the universe.the reason for floating is its density is less than density of medium in which it is floating
The volume of liquid displaced has the same mass as the floating object.
equal
a large mass of floating ice
A floe (ice floe) is the term we often apply to a mass or small field of floating ice.
There are glaciers in the Arctic, but the North Pole itself is not glaciated. This is because, by their very definition, glaciers are regions of fresh water ice on land, and quite different to sea ice. The North Pole itself does not lie on any land mass, but on a floating ice sheet known as the Greenland or Arctic ice sheet - therefore, there can be no glaciers on the North Pole.
Chunks do not really mean something very small like most people may think,it could be a large particle or huge mass. Floating chunks of ice from ice sheets or ice shelves (land ice) are called "ICEBERGS", while large areas of floating sea ice are called "ICE FLOES".