Discussion
Fault gouge differs from fault breccia in being
Answer: B
Correct answer: finely ground, clay-like material
Gouge and breccia are both products of crushing along a fault, differing in grain size. Gouge is ground to a clay-like paste and is often impermeable, so it can seal a fault; breccia is coarse angular fragments and is usually highly permeable, so it conducts water. Which of the two occupies a fault matters greatly to a tunnel or a dam foundation crossing it.
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