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Nirgil Vallis, Gorgonim Chaos and south polar pit
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Gorgonim chaos
Gorgonim Chaos is a set of canyons in the phaethontis quandrangle of mars. it is located at 37.5 digress south latitude and 170.9 digress west longtidu . its name comes from an albedo feature. some of the firist gullies on mars were found in gorgonim Chaos. it is generally believed that it once contained a lake. other nearby features are sirenum Fossase, Maadim vallis, Ariadnes Colles, and Atlantis Chaos. some of the surfaces in the region and formed from the electris deposits.
Nirgal Vallis
Nirgal Vallis is on of the longest river valley networks on mars. it is so large that it is found on two quadrangles. Scientists are not sure about how all the ancient river valley were formed. There is evidence that instead of rain or snow, the water that were formed the valleys originated under ground.One mechanism that has been advanced is sapping . In this case the ground just gives away as water comes out.Sapping is common some desert areas in Americans Southwest.It forms alcoves and stubby tributaries these features are visible in the pictures of Nirgal Vallis taken with mars odyssey's Tremius.
By:Christa, Shyian,Phyllis, Quynh and Vivien
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South Polar Pit
The polar ice caps of mars are instantly recognizable. but take a closer look at them, and the familiar gives way to some pretty strange landscapes. Consider, for example, the "SWISS CHEESE" terrian that marks the icy reaches of the southern cap. these are places where carbon dioxide ice sublimates ( turns from a solid directly to a gas) leaving behind pits a few meters deep. the pits from weird figures and patterns that change shape over time.