Approximately what percentage of the lunar surface do the dark maria cover?
Answer
About 17%
The vast, dark plains known as the maria occupy a significant but minority portion of the Moon's observable terrain. Scientific measurement indicates that these features cover approximately 17% of the total lunar surface area. Furthermore, their distribution is highly uneven; they are far more prevalent and widespread on the near side of the Moon when compared to the far side, which remains predominantly covered by the older, lighter highlands.
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