Multiple choice

Connard Discontinuity separates

  1. upper continental crust from the lower one

  2. crust from the mantle

  3. upper mantle from the lower one

  4. outer core from the inner core
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Explanation

The Conrad Discontinuity (named after S. Connard) is a boundary within the continental crust that separates the upper continental crust (felsic, granitic rocks) from the lower continental crust (more mafic rocks). It occurs at depths of 15-20 km and is detected by seismic velocity changes. The Mohorovicic discontinuity separates crust from mantle, Gutenberg separates mantle from core, and the core-mantle boundary separates outer core from inner core.

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