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staedtler staedtler
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What is the most likely cause of the smooth and relatively crater-free surfaces of lunar maria?
A)   Volcanic ash rained on the surfaces of the basins in recent geological times, covering previous craters.
B)   The lava in these basins flowed in the relatively late geological history of the Moon, after the period of major bombardment.
C)   Dust storms had eroded and smoothed the surface earlier in the Moon's history.
D)   Smoother sediments were left behind after water had flowed into the basins and evaporated away.
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Discovering the Universe

Discovering the Universe


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