Just as the Amazon, the Mississippi, the Zambezi, the Yangtze, and Earth’s other mighty rivers drain the continents, rivers also drain Antarctica, only in this frozen landscape, the rivers are ice. Under their own massive weight, the Antarctic Ice Sheets are constantly spreading out like a mound of batter on a griddle. The outer edges of the ice sheets crumble into the Southern Ocean as they spread, giving birth to icebergs. In some places, steep mountains channel the flowing ice sheet into fast-moving rivers of ice.
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