Plate tectonics
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Mu is the name of a hypothetical lost continent, which is thought to have been located in the Pacific Ocean before it sank beneath the waters, similar to Atlantis and Lemuria, with which it is sometimes identified.
General acceptance by the scientific community of the theory of plate tectonics ended any scientific basis for the once popular belief in sunken continents. Plate tectonics explains that continental masses are composed of the lighter SiAl (silicon/aluminium) type rocks which literally float on the heavier SiMg (silicon/magnesium) rocks which constitute ocean bottoms. There is no evidence of SiAl rock in the Pacific basin.
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