The Kola Superdeep Borehole and the Deepest Manmade Holes

The Mohorovičić discontinuity, or simply the Moho, is the transitional boundary between the crust of the Earth and the underlying mantle located 5-10 km (3-6 mi) beneath the ocean floor and 20-90 km (10-60 mi) beneath the surface of continents.  The Moho marks a transition from the basaltic rocks of the crust above it to…

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