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Mohorovičić discontinuity

or Moho

[moh-haw-roh-vuh-chich, -hoh- or moh-hoh] /ˌmoʊ hɔˈroʊ və tʃɪtʃ, -hoʊ- or ˈmoʊ hoʊ/
noun, Geology.
the discontinuity between the crust and the mantle of the earth, occurring at depths that average about 22 miles (35 km) beneath the continents and about 6 miles (10 km) beneath the ocean floor.
Origin of Mohorovičić discontinuity
1935-40; named after Andrija Mohorovičić (1857-1936), Croatian geophysicist, who discovered it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for mohorovicic discontinuity

Mohorovičić discontinuity

the boundary between the earth's crust and mantle, across which there is a sudden change in the velocity of seismic waves Often shortened to Moho
Word Origin
C20: named after Andrija Mohorovičić (1857–1936), Croatian geologist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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mohorovicic discontinuity in Science
Mohorovičić discontinuity
The boundary between the Earth's crust and mantle, located at an average depth of 8 km (5 mi) under the oceans and 32 km (20 mi) under the continents. The velocity of seismic primary waves across this boundary changes abruptly from 6.7 to 7.2 km (4.1 to 4.5 mi) per second in the lower crust to 7.6 to 8.6 km (4.7 to 5.3 mi) per second in the upper mantle. The boundary is estimated to be between 0.2 and 3 km (0.1 and 1.9 mi) thick and is believed to coincide with a change in rock type from basalts (above) to peridotites and dunites (below). It is named after its discoverer, Croatian seismologist Andrija Mohorovičić (1857-1936).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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