Chaos terrain on Mars is distinctive; nothing on Earth compares to it. Chaos terrain generally consists of irregular groups of large blocks, some tens of kilometers across and a hundred or more meters high. The tilted and flat topped blocks form depressions hundreds of metres deep. A chaotic region can be recognized by a rat's nest of mesas, buttes, and hills, chopped through with valleys which in places look almost patterned. Some parts of this chaotic area have not collapsed completely—they are still formed into large mesas, so they may still contain water ice. Chaos regions formed long ago. By counting craters (more craters in any given area means an older surface) and by studying the valleys' relations with other geological features, scientists have concluded the channels formed 2.0 to
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| - Martian chaos terrain (en)
- 火星混沌地形 (zh)
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| - 火星上的混沌地形（Chaos terrain on Mars）极为独特，地球上没有与之比似的地貌。混沌地形通常由方圆数几十公里，高达百米或以上的不规则大地块群组成，倾斜的平顶地块形成了数百米深的洼地。一处混沌区域可通过被谷道交错切割的桌山、地垛和山丘来识别，而一些谷地似乎带有图案地面。这些混沌区的部分区域还没有完全崩塌，它们仍形成了巨大的台地，因此，可能还贮藏着水冰。混沌地区形成于很久以前，通过陨石坑计数（任何给定区域内的陨坑越多意味着地表越古老）以及研究这些谷地与其他地质特征的关系，科学家得出结论，这些通道形成于20亿至38亿年前。 (zh)
- Chaos terrain on Mars is distinctive; nothing on Earth compares to it. Chaos terrain generally consists of irregular groups of large blocks, some tens of kilometers across and a hundred or more meters high. The tilted and flat topped blocks form depressions hundreds of metres deep. A chaotic region can be recognized by a rat's nest of mesas, buttes, and hills, chopped through with valleys which in places look almost patterned. Some parts of this chaotic area have not collapsed completely—they are still formed into large mesas, so they may still contain water ice. Chaos regions formed long ago. By counting craters (more craters in any given area means an older surface) and by studying the valleys' relations with other geological features, scientists have concluded the channels formed 2.0 to (en)
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| - Chaos terrain on Mars is distinctive; nothing on Earth compares to it. Chaos terrain generally consists of irregular groups of large blocks, some tens of kilometers across and a hundred or more meters high. The tilted and flat topped blocks form depressions hundreds of metres deep. A chaotic region can be recognized by a rat's nest of mesas, buttes, and hills, chopped through with valleys which in places look almost patterned. Some parts of this chaotic area have not collapsed completely—they are still formed into large mesas, so they may still contain water ice. Chaos regions formed long ago. By counting craters (more craters in any given area means an older surface) and by studying the valleys' relations with other geological features, scientists have concluded the channels formed 2.0 to 3.8 billion years ago. (en)
- 火星上的混沌地形（Chaos terrain on Mars）极为独特，地球上没有与之比似的地貌。混沌地形通常由方圆数几十公里，高达百米或以上的不规则大地块群组成，倾斜的平顶地块形成了数百米深的洼地。一处混沌区域可通过被谷道交错切割的桌山、地垛和山丘来识别，而一些谷地似乎带有图案地面。这些混沌区的部分区域还没有完全崩塌，它们仍形成了巨大的台地，因此，可能还贮藏着水冰。混沌地区形成于很久以前，通过陨石坑计数（任何给定区域内的陨坑越多意味着地表越古老）以及研究这些谷地与其他地质特征的关系，科学家得出结论，这些通道形成于20亿至38亿年前。 (zh)
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