Moho discontinuity en · NOUN
Meanings
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The Mohorovičić discontinuity; the Moho.
Specifically, they got the idea to drill through the ocean floor (the continental crust was too thick) to the Moho discontinuity and to extract a piece of the Earth's mantle for examination at leisure.
2003, Bill Bryson, A Short History of Nearly Everything, BCA, page 189: