The moon was once volcanically active with evidence of this volcanism left behind. The Apollo missions brought back rocks from the moon which were dated to be 4,000,000,000 (4 billion) years in age. The Apollo astronauts immediately noticed basalt rock upon their initial mission to the moon and this basalt rock could only have formed with volcanos present. The basalt rock on the moon can be seen with the naked eye and appears as the darker spots of the moon as the basalt has filled in the crater...
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