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What accounts for the low-lying, flat surface of Mars's north? On Earth's surface, higher and lower-lying areas have different types of crust one, thin and dense, is pulled toward Earth's center more strongly by gravity, and the planet's water naturally comes to sit over it, creating oceans. The processes that generate this oceanic crust drive plate tectonics.
Is Mars's north similarly characterized by a sort of crust different from other areas of the planet? Some researchers do see signs of tectonic activity surrounding the northern basin that suggest that it was created through the formation of new crust, like ocean basins on Earth. However MeGill points to northern bedrock structures that predate the features said to mark the start of the tectonic process. MeGill instead believes that through some novel mechanism the ancient surface sank to its current depth as a single unit. This would explain why features around the basin's edge, which would have formed as the surface dropped, seem to be younger than structures at its floor.
The third possibility is that the northern lowlands result from impacts. Some researchers suggest they formed as a series of big overlapping impact craters. Others, arguing that the odds against such a pattern of impacts are large, postulate a single event--the impact of an object bigger than any asteroid the solar system now contains.
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当前版本由 385458jgdw 更新于2023-07-30 15:25:16 感谢由 385458jgdw 对此题目的解答所做出的贡献。
当前版本由 385458jgdw 更新于2023-07-17 18:05:42 感谢由 385458jgdw 对此题目的解答所做出的贡献。
MG提bedrock是为了质疑的一个理论，第一个理论说这个basin的形成和地球机制一样，都是通过内部的板块运动造成的，所以选d
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当前版本由 271002mnk 更新于2024-03-26 23:59:31 感谢由 271002mnk 对此题目的解答所做出的贡献。
正確答案是D. 對馬爾斯北部盆地是通過新地殼的形成而形成的觀點提出異議。
文章提到了三種可能解釋馬爾斯北部平坦地表的理論。MeGill提出的理論與其他研究者認爲北部盆地是通過新地殼的形成（類似於地球上的海洋盆地）而形成的觀點不同。MeGill認爲，通過某種新的機制，古老的地表作爲一個整體沉降到了當前的深度。這解釋了爲什麼盆地邊緣的特徵看起來比其底部的結構年輕，這些邊緣特徵在地表下降時形成。因此，正確答案是D，表示MeGill對北部盆地是通過新地殼的形成而形成的觀點提出了異議。
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[数学 ]【新版】冲分救命题 -12222
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[数学 ]【新版】冲分救命题 -12221
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