Assertion: glacier's velocity | /r/CapableOf | require to maintain mass balance
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text: The strong, widespread correlation between ice thinning and ice velocity (>50 m yr−1), for example, on the Berg, Ferrigno, Venable, Pine Island, Thwaites, Smith and Getz glaciers, indicates that thinning is caused by the velocity of glaciers being well above that required to maintain mass balance, that is, ice stretches longitudinally, which causes it to thin vertically.