Discussion
The conventional maximum size ratio between successive rubble mound layers is about
Answer: D
Correct answer: 4 to 5
Successive layers of a rubble mound are conventionally sized within a ratio of about four or five to one in mass, so that the finer material beneath cannot wash out through the voids of the coarser above. Too large a step and the underlayer is lost through the armour, undermining it; too small a step and an unnecessary number of layers is required. The same filter reasoning governs the bottom layer against the sea bed.
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