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Smooth plains

The smooth plains seen on Mercury resemble lunar maria and are likewise, sparsely cratered, but may have formed from different processes than those on the Moon. Mercury's smooth plains might have been caused by large amounts of ejecta from the impacts that cratered the surface and formed the Caloris Basin. On the other hand, a volcanic origin is possible and would liken Mercury's plains to the Moon's maria.

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  • Part of Speech: noun
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  • Industry/Domain: Earth science
  • Category: Geology
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