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Crust Upper Mantle asthenosphere 1050 Km Moho Gutenburg 0 Km 2900 Km Inner 6371Km Core 5000Km Outer Core Lower Mantle Moho boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor. Moho. The boundary between the crust and the mantle in the earth. This is a depth where seismic waves change velocity and there is also a change in chemical composition. Also termed the Mohorovicic' discontinuity after the Croatian seismologist Andrija Mohorovicic' (1857-1936) who discovered it. The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor.
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