Contents

15 May 2009
Vol 324, Issue 5929

About The Cover

Cover image expansion

COVER Shaded perspective view of a surface topography of the West Antarctic Ice Sheet looking toward the Filchner-Ronne Ice Shelf and Antarctic Peninsula at the upper left. Floating ice shelves at the surface are in gray; the grounded ice sheet is shaded green to blue with increasing elevation. The topography was used to determine the volume of ice above sea level, as described on page 901 Image: David Vaughan, British Antarctic Survey