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Plato crater is sometimes called a “walled plain” because
its circular rim encloses a flat, smooth, almost featureless
plain and lacks the typical central peak of many impact
craters. After being formed, about 3 billion years ago,
Plato filled with lava, which cooled to the smooth, dark
basalt plain we see today. Only a few smaller impact craters
have been gouged out of the plain by younger impacts. Plato
crater is 101 kilometers across and about 1 kilometer deep.
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