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Ravi Vallis
Ravi Vallis is an ancient outflow channel, the source of which originates from the Aromatum Chaos depression, in the Margaritifer Sinus quadrangle (MC-19) region on Mars, located at 0.2° S and 40.7 W°. It is 205.5 km long and was named after the Ravi River, an ancient Indian river. The Ravi Vallis outflow channel, and the neighbouring deep depression at Aromatum Chaos, are thought to have been caused by volcano-ice interactions underneath the surface, which pierced the underground aquifer. This released large amounts of water, causing a catastrophic flood event, which is thought to have lasted between 2 and 10 weeks.〔(【引用サイトリンク】title=Planetary Names: Welcome )〕〔Leask, H. J., L. Wilson, and K. L. Mitchell (2006), Formation of Ravi Vallis outflow channel, Mars: Morphological development, water discharge, and duration estimates, J. Geophys. Res., 111, E08070, doi:10.1029/2005JE002550. 〕〔(【引用サイトリンク】title=A Flash In the Valley )〕〔http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1151.pdf〕〔http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1544.pdf〕〔Leask, H. J., L. Wilson, and K. L. Mitchell (2006), Formation of Aromatum Chaos, Mars: Morphological development as a result of volcano-ice interactions, J. Geophys. Res., 111, E08071, doi:10.1029/2005JE002549.〕
Wikichaosmap.jpg|Tography map of Oxia Palus region of Mars showing the location of a number of chaos regions and valleys, including Ravi Vallis. Ravi Vallis is small compared to some of the other chaos region on this map; it is close to the bottom of the map, near the equator.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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