Term Bank - mohorovicic discontinuity - Spanish English Dictionary Term Bank - mohorovicic discontinuity - Spanish English Dictionary

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He interpreted the acceleration of seismic waves observed within Earth's outer shell as a compositional change within the Earth. A photo of rock from one of these locations is shown on this page. The Mohorovicic Discontinuity, or "Moho," is the boundary between the crust and the mantle.

Mohorovicic realized that the velocity of a seismic wave is related to the density of the material that it is moving through.

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In geology the word "discontinuity" is used for a surface at which seismic waves change velocity. The red line in the diagram shows its location.

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He discovered that the oceanic crust has a relatively uniform thickness, while continental crust is thickest under mountain ranges and thinner under plains. It was drilled to a depth of about 12 kilometers.

This surface is known as the Mohorovicic Discontinuity or often simply referred to as the "Moho.

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At this discontinuity, seismic waves accelerate. As stated above, it occurs at an average depth of about 8 kilometers beneath the ocean basins and 32 kilometers beneath continental surfaces.

Mohorovicic discontinuity

The Mohorovicic Discontinuity marks the lower limit of Earth's crust. One of these surfaces exists at an average depth of 8 kilometers beneath the ocean basin and at an average depth of about 32 kilometers beneath the continents. The map below illustrates the thickness of Earth's crust.

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The deepest well that has been drilled to date was located on the Kola Peninsula of the Soviet Union. Drilling to the Moho through oceanic crust has also been unsuccessful.

Note how the thickest areas red and dark brown are beneath some of Earth's important mountain ranges such as the Andes west side of South AmericaRockies Western North AmericaHimalayas north of India in South-central Asiaand Urals north-south trending between Europe and Asia.

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Mantle rock at surface: The acceleration must be caused by a higher density material being present at depth.

The Mohorovicic Discontinuity was discovered in by Andrija Mohorovicic, a Croatian seismologist. There are a few rare locations where mantle material has been brought to the surface by tectonic forces.

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Mohorovicic was able to use his discovery to study thickness variations of the crust. No one has ever been deep enough into the Earth to see the Moho, and no wells have ever been drilled deep enough to penetrate it.

Synonyms for Mohorovicic

How Deep is the Moho? The lower density material immediately beneath the surface is now commonly referred to as "Earth's crust.

Has Anyone Ever Seen the Moho? Drilling wells to that depth is very expensive and very difficult because of the extreme temperature and pressure conditions.

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Ancient mantle rock exposed at the surface.