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(Click on any image for a larger view)
Landforms produced by wind: Wind is the force behind dust storms, dune fields, and wind streaks. |
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 Orbiter image showing a large dust storm over the Thaumasia region on Mars. This large disturbance grew into the first global dust storm observed by the Viking Orbiters. |
 Viking 2 Orbiter image of Mars. Dune fields are visible within a 50 km impact crater in the high-latitude south polar plains. |
 Viking 2 Orbiter image of wind streaks in the Memnonia region. The dark areas may result from erosion, while the light streaks are caused by deposition of light colored material. |
This Viking 1 Orbiter image shows a dune field in the Kaiser Crater on Mars. Wind blown particles have been trapped in the crater allowing the dunes to develop. |
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Landforms created by water: Water carves channels and canyons, and pools to form lakes and glaciers. |
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 MOC image of terrain adjacent to the Schiaparelli Crater showing characteristics similar to dry lakebeds found in the southwestern United States. |
 MOC image of Nanedi Vallis, a canyon possibly created by sustained water flow. |
 Viking 1 image of Parana Valles drainage system in Margaritifer Sinus. |
 Viking 1 Orbiter image of mottled terrain in Utopia Planitia. The origin of these curved hill and ridge segments may be related to shorelines of large lakes or ice or glacial action. |
Landforms affected by seasons: Seasonal temperature changes cause the polar caps to grow and shrink. |
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 MOC view of the north polar region of Mars obtained on September 12, 1998. The swirled pattern at the top center of the picture is an area of polar layered deposits covered in part by the permanent north polar ice cap. |
 Mosaic of Viking 2 Orbiter images of the south pole of Mars. The cap is about 400 km across in this image, taken during southern winter. |
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