Greenland Lake Surface View
http://www.nasa.gov/images/content/222867main_boat_ice_lg.jpg Ian Howat and Twila Moon of the University of Washington in Seattle conduct a sonar survey of a melt lake on the surface of the Greenland Ice Sheet. Credit: Joughin/UW Polar Science Center http://www.nasa.gov/topics/earth/features/greenland_speedup.html


