greenland's ice sheet thickness
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greenland's ice sheet thickness
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greenland's ice sheet thickness, greenland ice sheet thickness map, size of the greenland ice sheet, how big is the greenland ice sheet, thickness of ice in greenland, how thick is greenland's ice, volume of greenland ice sheet, how thick is the ice in greenland, greenland ice sheet area, what is the greenland ice sheet, greenland ice sheet mass, greenland ice sheet facts, greenland ice sheet total mass