NASA's Mars Global Surveyor shows collapse pits and troughs on the lower northeast flank of the giant martian volcano, Ascraeus Mons on Mars.

24 September 2005
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows collapse pits and troughs on the lower northeast flank of the giant martian volcano, Ascraeus Mons. Layers of volcanic rock are evident in some of the pit and valley walls, and boulders the size of houses and trucks that were liberated from these walls by gravity can be seen on the floors of the depressions.

Location near: 13.6°N, 102.6°W
Image width: width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Northern Autumn

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