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8 l% Z( B1 ?$ a- z0 }4 `COVER A jumble of icebergs forms in front of the heavily crevassed
' C/ d/ Q6 ~. n8 ucalving front of Jakobshavn Isbr?, one of the fastest outlet glaciers draining $ k7 e" A0 }9 F: a: l0 W# r6 A
the Greenland Ice Sheet. The ~5-kilometer-wide ice front rises ~80 meters out of - q! b4 e2 j7 I
the water and extends more than 600 meters underwater. Recent research shows % ?/ Z5 `$ N8 U0 ^8 R0 l
that the speeds of Greenland glaciers are increasing. See page 576. Photo:
9 Y9 v% S5 F } c7 H6 vIan Joughin
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