Source of Lunar Basalt
Lunar surface basalts are believed to have their origins in partially melted areas 100-400 kilometers (60-250 miles) beneath the large meteoroid impact basins. The basaltic material welled up into the basins through cracks created by the impacts. The basalt flows covered areas up to 1200 kilometers (750 miles) away from where they had arisen.
Image Number: WEB13289-2013
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