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A conglomerate differs from a breccia in having fragments that are

  • A.finer than sand
  • B.of a single mineral
  • C.rounded
  • D.angular

Answer: C

Correct answer: rounded

Both are coarse clastic rocks with fragments above 2 mm; the difference is in the shape of those fragments. Rounded clasts have been transported far enough for their corners to be abraded away, so a conglomerate records distance or vigorous water. Angular clasts have travelled little, so a breccia records a scree, a fault zone or a collapse near its source.

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