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If wave velocity changes at the Moho boundary which conclusion is most suitable?

Answer and explanation

Correct answer: Properties of crust and mantle are different

The Moho, or Mohorovičić discontinuity, is the boundary between Earth’s crust and mantle. Seismic waves do not travel through every material at the same speed. When they cross from crustal rocks into mantle material, their speed changes because the composition, density, and elastic properties of the material change. This measurable change helps scientists identify the boundary.

The observation does not indicate a rainfall, population, or river-bed boundary. It is evidence of a physical change inside Earth. The Moho may vary in depth beneath different regions, but its essential meaning remains the crust–mantle boundary. Therefore, option B is correct: a change in wave velocity at the Moho indicates that the properties of the crust and mantle are different.

Related tags

MohoCrust-MantleSeismic-Velocity

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