National Geographic : 1963 Feb
If Antarctica's ice all melted, the world's seas would rise some 250 feet, engulfing New York Harbor's Statue of Liberty to nose level. Antarctica: New look at a continent WHAT LIES beneath Antarctica's 7,000,000 cubic miles of ice? A decade ago, no one could have hazarded more than a guess. Now, for the first time, scientists have fathomed enough of the ice sheet and charted enough of the underlying surface to produce an astonishing picture of a rock-and dirt continent that man has never seen. These paintings, painstakingly prepared by National Geographic carto graphic artists, coordinate what scientists have learned and what they project on the basis of their knowledge. The maps reflect surveys by men of a dozen nations, particularly some 15,500 miles of traverses by tractor train, dog sled, and foot. Scientists on these traverses have made upwards of 5,000 gravity measurements. In addition, they have plumbed the ice sheet at perhaps a thousand points by exploding charges and measuring the time sound takes to travel down to bedrock and echo back to seismometers on the surface. These revealing views have been made possible by use of a new relief model of Antarctica prepared by the U. S. Geological Survey in cooperation with the National Science Foundation, and by the work of the University of Wisconsin, Ohio State University, and the U. S. Coast and Geodetic Survey.