If a strong flood event deposited an additional coarse layer on the Lorn site, how might this change the site's overall stability?
Answer
A
Stability would decrease because uneven layering could introduce weak contact zones between layers.
B
Stability would increase because thicker layers always resist stress better.
C
Stability would increase as additional porosity improves water drainage.
D
Stability would remain unchanged since new deposition doesn't affect underlying rock cohesion.
Explanation
A new coarse layer can create an uneven boundary where it meets the existing material. That contact zone may be weaker than the layers themselves and could allow slipping or separation, reducing the site's overall stability. A thicker layer does not automatically provide more strength.
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