We've got to follow it north until we hit the polar cap.
Maybe we should have tried to reach the edge of the polar cap.
It has two polar ice caps, the larger of which I call north.
Those white polar caps you see are ice and snow.
Like the bottom of the ocean, or a polar ice cap.
The south polar permanent cap is much smaller the one in the north.
The two polar ice caps appear to be made largely of water.
The Earth's polar ice caps have changed dramatically over the last 12,000 years.
And that white crescent out in the middle of things was the polar cap!
The southern polar ice cap is putting on the most dynamic show.