FIGURE 8.1 The gullies at the edge of this crater may have been formed recently by groundwater flowing to the surface from specific horizons. Image from the Mars Orbiter Camera on the Mars Global Surveyor spacecraft courtesy of NASA/JPL/Malin Space Science Systems.

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement