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单词 Mansurian
释义
Mansurian

Geology and Earth Sciences
  • The fourth period of the Mercurial geologic timescale, lasting 3000–1000 Ma ago, during which the contraction of the planet Mercury came to an end, crater formation lessened, and the planet cooled, leading to a thickening of its lithosphere, and there was a decrease in geologic activity. Craters formed during the Mansurian lacked rays.


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