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Between the Earth's crust and outer mantle is a thin boundary region known as the Mohorovičić Discontinuity; scientists usually refer to it as "the Moho". The precise composition and physical nature of the Moho is not known, but it is identifiable by a distinct physical behavior; earthquake P-waves abruptly increase velocity at this boundary. This physical discontinuity was first identified in 1909 by Andrija Mohorovičić of Croatia. The Mojo lies an average depth of 7 km (4.3 miles) beneath the ocean floors, and 30 to 75 km (18 to 46 miles) beneath the continental surfaces. There have been plans and attempts to drill through the Earth's crust to reach the Mojo, but none have been successful up to this point; the research continues.

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What is the layer of the earth between the core and the crust?

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What layer is MOHO directly above?

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