Multiple choice

The boundary between the crust and the mantle is called the ________.

  1. mohorovic discontinuity

  2. magma

  3. gutenberg discontinuity

  4. asthenosphere
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A Correct answer
Explanation

The Mohorovicic discontinuity (Moho) is the boundary between Earth's crust and the mantle. It was discovered by Andrija Mohorovicic in 1909 when he observed seismic wave velocity changes at this boundary. The Moho varies in depth - about 5-10 km under oceans and 30-50 km under continents. The Gutenberg discontinuity marks the core-mantle boundary instead.

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