Water on Mars:
image 7707 (above) shows a portion of the wall and floor of an ancient impact crater in the southern cratered terrain of Noachis Terra. The MOC image reveals v-shaped depressions on the crater wall that are characteristic of water seepage from an underground layer that is exposed in the crater walls. The image also shows a smooth, dark surface on the crater floor that might be interpreted as the remains of a pond or lake.
see it here
see it here
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