Mercury's surface is covered with craters.
Meaning: The outermost layer of Mercury is marked with holes caused by impacts of objects.
Choice of Words: Mercury's shows possession or ownership of something related to Mercury, surface is the outer layer of something, is indicates existence or a state of being, covered means to be completely hidden or concealed by something, with indicates an association or connection between things, craters are bowl-shaped depressions on the surface of a planet or moon.
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