28 November 1986
Vol 234, Issue 4780

About The Cover

Landsat image of Byrd Glacier, Antarctica. The glacier (about 25 kilometers wide) flows through the Transantarctic Mountains (left and right) and empties into the Ross Ice Shelf (top). Transverse crevasses, developed where the glacier enters the shelf, remain visible over many years and enable time-lapse measurements of ice velocities. See page 1105. [Landsat-1 multispectral-scanner image 1542-18435, 16 January 1974, path 46, row 119; B. K. Lucchitta and H. M. Ferguson, U.S. Geological Survey, Flagstaff, AZ 86001]