Volcanic activity on Mercury

Volcanic activity on Mercury

Fig. 2.29 . This double-ringed impact basin on Mercury has a smooth inner floor attributed to lava flows that partially flooded the basin some time after impact. The basin is approximately 60 kilometers in diameter. This image was acquired from the MESSENGER spacecraft on 29 September 2009. (Courtesy of NASA/JHUAPL/CIW.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University