Sediments show bipolar melting cycle

By Sid Perkins, 15:47 PM April 15, 2008

Evidence harvested from ocean sediments suggests that the North and South Poles have experienced regular periods of significant melting simultaneously.

A 600-meter core drilled from a site off Greenland's eastern coast and a 200-m core from off Antarctica reveal several episodes of particularly high sediment accumulation in the past 3 million years, says Kristen E. St. John, a geologist at Appalachian State University in Boone, N.C.

These spates of high sedimentation occurred about 0.9 million...

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