Mohorovičić discontinuity
term in geography: boundary between the Earth's crust and the mantle
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Earth's crust and mantle, Moho discontinuity between bottom of crust and solid uppermost mantle
The Mohorovičić discontinuity (/ˌmoʊhəˈroʊvɪtʃɪtʃ/ MOH-hə-ROH-vih-chitch; Croatian: [moxorôʋiːtʃitɕ]), usually called the Moho discontinuity, Moho boundary, or just Moho, is the boundary between the crust and the mantle of Earth. It is defined by the distinct change in velocity of seismic waves as they pass through changing densities of rock.