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题目材料：
Study of the geological history of the Moon is based on the law of superposition, which states that younger rocks and geological features visibly overlie older rocks and features. For example, lines—or "rays"—radiate outward from the crater Copernicus and overlie the rim of the neighboring crater Eratosthenes, demonstrating that Copernicus is younger. Both of these craters are younger than the dark lava plain, Mare Imbrium, upon which they lie. In contrast, the crater Archimedes is filled with and surrounded by this dark lava, from which its rim protrudes; thus, the impact that created Archimedes predates the lava eruption that flooded the whole region to create Mare Imbrium. All the foregoing features occur inside the giant Imbrium basin, itself a kind of colossal impact crater. Thus, the relative ages of surface features in the Imbrium-Copernicus region were unambiguously derivable from photographs taken from Earth well before any lunar missions. Their absolute ages, however, were only later inferred from physical samples of lunar rock.
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以上解析由 考满分老师提供。
