lód dryfujący

They had drifted slowly out to the edge of the pack ice.

The strait is difficult to pass because of pack ice.

In summer they live along the edges of the pack ice near the island.

Polar bears live most of their lives out on the pack ice.

They still have to use guides out on the pack ice up north, though.

The pack ice in his best picture is like a field of white carnations.

She is strengthened against pack ice, and can turn on her own axis.

Three days of hard, dangerous walking remained, the last day over pack ice.

Up to that time, no one had attempted to land because of the surrounding pack ice.

The Antarctic summer causes the pack ice to break up.