Multiple choice

Which of the following represents wall like formation of solidified magma and are mostly perpendicular to the beds of the sedimentary rocks?

  1. Dyke

  2. Sills

  3. Lapilli

  4. Breccia

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A Correct answer
Explanation

A dyke is a wall-like formation of solidified magma that cuts across sedimentary rock beds, usually perpendicular to them. Sills are sheet intrusions parallel to bedding planes. Lapilli are small volcanic rock fragments, and breccia is a rock composed of broken fragments.