The 750 or so icebergs that break off from glaciers each year and drift south from Greenland are floating masses of freshwater ice formed in the pristine air of 3, 000 B.

FORBES: It's The Tap Of The Iceberg

The 750 or so icebergs that break off from glaciers each year and drift south from Greenland are floating masses of freshwater ice formed in the pristine air of 5, 000 years ago.

FORBES: It's The Tap Of The Iceberg

"Those water masses play a very important role in the present-day status of the ice pack and changes in the delivery would have an influence and effect on ice distribution, " said Weingartner.

CNN: Nuclear sub dives under the ice to explore climate change