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- Fretted_terrain abstract "Fretted terrain is a type of surface feature common to certain areas of Mars and was discovered in Mariner 9 images. It lies between two different types of terrain. The surface of Mars can be divided into two parts: low, young, uncratered plains that cover most of the northern hemisphere, and high-standing, old, heavily cratered areas that cover the southern and a small part of the northern hemisphere. Between these two zones is the fretted terrain, containing a complicated mix of cliffs, mesas, buttes, and straight-walled and sinuous canyons. It contains smooth, flat lowlands along with steep cliffs. The scarps or cliffs are usually 1 to 2 km high. Channels in the area have wide, flat floors and steep walls. Fretted terrain is most common in northern Arabia, between latitudes 30°N and 50°N and longitudes 270°W and 360°W. Two good examples of fretted terrain are Deuteronilus Mensae and Protonilus Mensae.In fretted terrain, the land seems to transition from narrow straight valleys to isolated mesas. Most of the mesas are surrounded by forms that have been given a variety of names: circum-mesa aprons, debris aprons, rock glaciers, and lobate debris aprons. At first, they appeared to resemble rock glaciers on Earth. But scientists could not be sure. Even after the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) took a variety of pictures of fretted terrain, experts could not tell for sure if material was moving or flowing as it would in an ice-rich deposit (glacier). Eventually, proof of their true nature was discovered when radar studies with the Mars Reconnaissance Orbiter showed that they contained pure water ice covered with a thin layer of rocks that insulated the ice.Besides rock-covered glaciers around mesas, the region had many steep-walled valleys with lineations—ridges and grooves—on their floors. The material comprising these valley floors is called lineated valley fill. In some of the best images taken by the Viking Orbiters, some of the valley fill appeared to resemble alpine glaciers on Earth. Given this similarity, some scientists assumed that the lineations on these valley floors might have formed by flow of ice in (and perhaps through) these canyons and valleys. Today it is generally agreed that glacial flow caused the lineations.".
- Fretted_terrain wikiPageID "23006332".
- Fretted_terrain wikiPageLength "12445".
- Fretted_terrain wikiPageOutDegree "67".
- Fretted_terrain wikiPageRevisionID "660983180".
- Fretted_terrain wikiPageWikiLink Arabia_Terra.
- Fretted_terrain wikiPageWikiLink Axial_tilt.
- Fretted_terrain wikiPageWikiLink Brain_terrain.
- Fretted_terrain wikiPageWikiLink Butte.
- Fretted_terrain wikiPageWikiLink Canyon.
- Fretted_terrain wikiPageWikiLink Category:Geology_of_Mars.
- Fretted_terrain wikiPageWikiLink Cebrenia_quadrangle.
- Fretted_terrain wikiPageWikiLink Climate_of_Mars.
- Fretted_terrain wikiPageWikiLink Coloe_Fossae.
- Fretted_terrain wikiPageWikiLink Deuteronilus_Mensae.
- Fretted_terrain wikiPageWikiLink Geology_of_Mars.
- Fretted_terrain wikiPageWikiLink Glacier.
- Fretted_terrain wikiPageWikiLink Glaciers.
- Fretted_terrain wikiPageWikiLink Glaciers_on_Mars.
- Fretted_terrain wikiPageWikiLink Hellas_quadrangle.
- Fretted_terrain wikiPageWikiLink HiRISE.
- Fretted_terrain wikiPageWikiLink HiWish_program.
- Fretted_terrain wikiPageWikiLink Ice.
- Fretted_terrain wikiPageWikiLink Ismenius_Lacus_quadrangle.
- Fretted_terrain wikiPageWikiLink Lineated_Valley_Fill.
- Fretted_terrain wikiPageWikiLink Lineated_valley_fill.
- Fretted_terrain wikiPageWikiLink Lobate_Debris_Apron.
- Fretted_terrain wikiPageWikiLink Lobate_debris_apron.
- Fretted_terrain wikiPageWikiLink Mariner_9.
- Fretted_terrain wikiPageWikiLink Mars.
- Fretted_terrain wikiPageWikiLink Mars_Global_Surveyor.
- Fretted_terrain wikiPageWikiLink Mars_Orbiter_Camera.
- Fretted_terrain wikiPageWikiLink Mars_Reconnaissance_Orbiter.
- Fretted_terrain wikiPageWikiLink Martian_dichotomy.
- Fretted_terrain wikiPageWikiLink Mesa.
- Fretted_terrain wikiPageWikiLink Mesas.
- Fretted_terrain wikiPageWikiLink Moons_of_Mars.
- Fretted_terrain wikiPageWikiLink Nilosyrtis_Mensae.
- Fretted_terrain wikiPageWikiLink Phlegra_Montes.
- Fretted_terrain wikiPageWikiLink Protonilus_Mensae.
- Fretted_terrain wikiPageWikiLink Reull_Vallis.
- Fretted_terrain wikiPageWikiLink THEMIS.
- Fretted_terrain wikiPageWikiLink Viking_Orbiter.
- Fretted_terrain wikiPageWikiLink Viking_program.
- Fretted_terrain wikiPageWikiLink Water_on_Mars.
- Fretted_terrain wikiPageWikiLinkText "Fretted terrain".
- Fretted_terrain wikiPageWikiLinkText "fretted terrain".
- Fretted_terrain hasPhotoCollection Fretted_terrain.
- Fretted_terrain wikiPageUsesTemplate Template:Mars.
- Fretted_terrain wikiPageUsesTemplate Template:Portal_bar.
- Fretted_terrain wikiPageUsesTemplate Template:Reflist.
- Fretted_terrain subject Category:Geology_of_Mars.
- Fretted_terrain hypernym Feature.
- Fretted_terrain type Work.
- Fretted_terrain comment "Fretted terrain is a type of surface feature common to certain areas of Mars and was discovered in Mariner 9 images. It lies between two different types of terrain. The surface of Mars can be divided into two parts: low, young, uncratered plains that cover most of the northern hemisphere, and high-standing, old, heavily cratered areas that cover the southern and a small part of the northern hemisphere.".
- Fretted_terrain label "Fretted terrain".
- Fretted_terrain sameAs m.064k63v.
- Fretted_terrain sameAs Q5503230.
- Fretted_terrain sameAs Q5503230.
- Fretted_terrain wasDerivedFrom Fretted_terrain?oldid=660983180.
- Fretted_terrain isPrimaryTopicOf Fretted_terrain.