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Mons (planetary nomenclature)
Mons (plural: montes, from the Latin word for "mountain") is a mountain on a celestial body. The term is used in planetary nomenclature: it is a part of the international names of such features. It is capitalized and usually stands after the proper given name, but stands before it in the case of lunar mountains (for example, there is a Martian mountain Arsia Mons and a lunar mountain Mons Argaeus).〔
The term ''tholus'' ("dome") is used for names of smaller (especially domical) uplands, and the term ''colles'' ("hills") in names of groups of still smaller knobs. Peculiar round mountains found on Venus get names with the term ''farrum''.〔
==Nature of montes==
The term ''mons'', like other terms of planetary nomenclature, describes only the external view of the feature, but not its origin or geological structure. It is used for mountains of any origin, and objects in this class are very diverse. Usually they are results of tectonic, impact or volcanic processes. Examples of such mountains are the Maxwell Montes on Venus,〔 the Montes Apenninus on the Moon〔 and Olympus Mons on Mars,〔 respectively. More unusual origins are also possible. For example, the Geryon Montes of Mars are an erosional remnant of a former plateau within Ius Chasma, part of the Valles Marineris canyon system.
During impact events, mountains can appear not only on the border of the resulting crater, but also in its center. Classical central peaks generally are not named, although some peaks within craters are named: for example, Aeolis Mons within Gale crater on Mars or the Scheria Montes within Odysseus crater on Tethys.
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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