Glaciologists have uncovered large valleys in the ocean floor beneath some of the massive glaciers flowing into the Amundsen Sea in West Antarctica. The troughs enable warm, salty water to reach the undersides of glaciers, fueling their increasingly rapid retreat.

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Glaciologists have uncovered large valleys in the ocean floor beneath some of the massive glaciers flowing into the Amundsen Sea in West Antarctica. The troughs enable warm, salty water to reach the undersides of glaciers, fueling their increasingly rapid retreat.