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A sharp change in seismic-wave velocity at the boundary between the crust and mantle is known as which discontinuity?

Answer and explanation

Correct answer: Moho discontinuity

Answer: D, the Moho discontinuity. The Moho, or Mohorovičić discontinuity, is the boundary between Earth’s crust and the mantle. Seismic waves change velocity noticeably as they pass from crustal material into mantle material because the composition and physical properties of the rocks change. Option A, the Gutenberg discontinuity, is associated with the boundary between the mantle and the outer core. Option B, the Lehmann discontinuity, refers to the boundary between the outer core and inner core. Option C, the Repetti discontinuity, is a boundary within the mantle, not the crust–mantle boundary. Therefore only option D fits both the location and the seismic-wave clue. Memory cue: Moho means mantle begins below the crust; Gutenberg is mantle–outer core, and Lehmann is outer–inner core.

Related tags

Moho DiscontinuitySeismic WavesCrust And MantleInterior Of The EarthInterior Structure Of The EarthGeographyClass 11 Mcq

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