Contents

23 April 1993
Vol 260, Issue 5107

About The Cover

Eastern Aphrodite Terra, Venus, looking south across Miralaidji corona (image, ˜300 kilometers across). Foreground lineaments represent crustal fractures; rectangles indicate missing data. The blistering of eastern Aphrodite Terra by magma diapirs indicates that it is neither a divergent nor a convergent plate boundary as previously interpreted. See page 526. [Image: David P. Anderson, Southern Methodist University, using NASA Magellan SAR and altimetry data; vertical exaggeration, 20 times]