Updated: 1 FEBRUARY 2012 

The Floor of Toro CraterThe Floor of Toro Crater
Toro Crater may have experienced hydrothermal alteration, producing diverse minerals.
Crater with Gullies on a Central StructureCrater with Gullies on a Central Structure
The formation of channels on the debris aprons supports the hypothesis that these sediments were transported down the gullies and then deposited onto the aprons by flowing water.
Active Erosion in Pasteur CraterActive Erosion in Pasteur Crater
This image shows knobs and bluffs that are being actively eroded by the Martian wind.
Another Well-Preserved Impact CraterAnother Well-Preserved Impact Crater
When seen at full resolution, almost all craters on Mars show some modification such as subsequent smaller impacts, and downslope movement of material on steep slopes.
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