外洋

海の氷(こおり)はきわめて変わりやすい——寒く風(かぜ)のない天候のときは固く凍っているが、嵐のときは外洋の広い水域で割れてしまう。

The sea ice is highly variable - frozen solid during cold, calm weather and broken up in large areas of open water during storms.