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- Terrain_softening abstract "The landscape polewards of around 30 degrees latitude on Mars has a distinctively different appearance to that nearer the equator, and is said to have undergone terrain softening. Softened terrain lacks the sharp ridge crests seen near the equator, and is instead smoothly rounded. This rounding is thought to be caused by high concentrations of water ice in soils. The term was coined in 1986 by Steve Squyres and Michael Carr from examining imagery from the Viking missions to Mars.Below 30 degrees of latitude, impact craters have steep walls; well-defined, sharp rims; and flat or smoothly bowl-shaped floors. Ridges on intercrater plains come to similarly well-defined, pointed crests. However, above this latitude, these same features appear very different. The crests seen on ridges and crater rims appear strongly rounded and much more poorly defined. The relief (height) of features is somewhat reduced. Small craters are noticeably less common. In other words, terrain which elsewhere looked sharp here looks \"soft\". This texture has also been described as \"smooth\", or \"rolling\". Softened craters are also commonly infilled with concentric patterns on their floors.On Earth, diffusive creep of soils is associated with rounded hillslopes. Squyres and Carr thus attributed the softened texture to accelerated viscous creep in shallow soils near the surface, and went on to associate this accelerated creep with the presence of ground ice at these latitudes. This conclusion has been largely borne out by subsequent research. In the late 1980s some attempts were made to link terrain softening with dust and aeolian processes, though this hypothesis has largely been superseded by more recent observations.Terrain softening is one of a suite of features seen in the midlatitudes of Mars—also including lobate debris aprons, lineated valley fill, concentric crater fill, latitude dependent mantle, patterned ground, viscous flow features, arcuate ridges, recurring slope lineae, and gullies—whose form and distribution strongly suggest the abundance of ice at the surface.".
- Terrain_softening thumbnail Context_image_for_argyrefeatures.JPG?width=300.
- Terrain_softening wikiPageID "40094589".
- Terrain_softening wikiPageLength "5447".
- Terrain_softening wikiPageOutDegree "34".
- Terrain_softening wikiPageRevisionID "567122460".
- Terrain_softening wikiPageWikiLink Aeolian_processes.
- Terrain_softening wikiPageWikiLink Arabia_Terra.
- Terrain_softening wikiPageWikiLink Category:Geology_of_Mars.
- Terrain_softening wikiPageWikiLink Category:Geomorphology.
- Terrain_softening wikiPageWikiLink Category:Patterned_grounds.
- Terrain_softening wikiPageWikiLink Category:Permafrost.
- Terrain_softening wikiPageWikiLink Category:Surface_features_of_Mars.
- Terrain_softening wikiPageWikiLink Climate_of_Mars.
- Terrain_softening wikiPageWikiLink Concentric_crater_fill.
- Terrain_softening wikiPageWikiLink Diffusion.
- Terrain_softening wikiPageWikiLink Downhill_creep.
- Terrain_softening wikiPageWikiLink Eridania_quadrangle.
- Terrain_softening wikiPageWikiLink Geology_of_Mars.
- Terrain_softening wikiPageWikiLink Glaciers_on_Mars.
- Terrain_softening wikiPageWikiLink Gully_(Mars).
- Terrain_softening wikiPageWikiLink Lineated_valley_fill.
- Terrain_softening wikiPageWikiLink Lobate_debris_apron.
- Terrain_softening wikiPageWikiLink Mars.
- Terrain_softening wikiPageWikiLink Patterned_ground.
- Terrain_softening wikiPageWikiLink Periglaciation.
- Terrain_softening wikiPageWikiLink Permafrost.
- Terrain_softening wikiPageWikiLink Saheki_(crater).
- Terrain_softening wikiPageWikiLink Seasonal_flows_on_warm_Martian_slopes.
- Terrain_softening wikiPageWikiLink Solifluction.
- Terrain_softening wikiPageWikiLink Steve_Squyres.
- Terrain_softening wikiPageWikiLink Terrain.
- Terrain_softening wikiPageWikiLink Viking_program.
- Terrain_softening wikiPageWikiLink Water_on_Mars.
- Terrain_softening wikiPageWikiLink Zumba_(crater).
- Terrain_softening wikiPageWikiLink File:Context_image_for_argyrefeatures.JPG.
- Terrain_softening wikiPageWikiLinkText "Terrain softening".
- Terrain_softening wikiPageUsesTemplate Template:Mars.
- Terrain_softening wikiPageUsesTemplate Template:Portal.
- Terrain_softening wikiPageUsesTemplate Template:Reflist.
- Terrain_softening subject Category:Geology_of_Mars.
- Terrain_softening subject Category:Geomorphology.
- Terrain_softening subject Category:Patterned_grounds.
- Terrain_softening subject Category:Permafrost.
- Terrain_softening subject Category:Surface_features_of_Mars.
- Terrain_softening comment "The landscape polewards of around 30 degrees latitude on Mars has a distinctively different appearance to that nearer the equator, and is said to have undergone terrain softening. Softened terrain lacks the sharp ridge crests seen near the equator, and is instead smoothly rounded. This rounding is thought to be caused by high concentrations of water ice in soils.".
- Terrain_softening label "Terrain softening".
- Terrain_softening sameAs Q16152273.
- Terrain_softening sameAs m.0wfw9s7.
- Terrain_softening sameAs Q16152273.
- Terrain_softening wasDerivedFrom Terrain_softening?oldid=567122460.
- Terrain_softening depiction Context_image_for_argyrefeatures.JPG.
- Terrain_softening isPrimaryTopicOf Terrain_softening.