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Scientists believe that groundwater sapping created these gullies in Noachis Terra on Mars.[citation needed] NASA image.
Scientists believe that groundwater sapping created these gullies in Noachis Terra on Mars.[citation needed] NASA image.
The two canyons at center-left in this photo from Canyonlands National Park in Utah have the theater-shaped heads typical of valley features shaped by
The two canyons at center-left in this photo from Canyonlands National Park in Utah have the theater-shaped heads typical of valley features shaped by groundwater sapping. The Green River is at right.
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Branched valley network in Thaumasia quadrangle, as seen by Viking Orbiter. Field of view is roughly 200 km across.
Branched valley network in Thaumasia quadrangle, as seen by Viking Orbiter. Field of view is roughly 200 km across.
Part of a valley network near Warrego Valles, seen by THEMIS. Length of image is roughly 50 km.
Part of a valley network near Warrego Valles, seen by THEMIS. Length of image is roughly 50 km.
Finer scale valley networks near Candor Chasma, seen by HiRISE (click to zoom). Field of view is roughly 3.5 km across. Surface the valleys are cut in
Finer scale valley networks near Candor Chasma, seen by HiRISE (click to zoom). Field of view is roughly 3.5 km across. Surface the valleys are cut into appears to be eroding back.
The Eberswalde delta, seen by MGS. Note the meanders with cutoffs, now seen in inverted relief.
The Eberswalde delta, seen by MGS. Note the meanders with cutoffs, now seen in inverted relief.