Discussion
Match each armour unit type with its characteristic.
List I
A. Rock
B. Cube
C. Tetrapod
D. Accropode
List II
1. interlocking unit with slender projecting legs
2. natural material, limited by available size
3. single layer interlocking unit of high stability
4. simple concrete unit relying on its own weight
Answer: D
Correct answer: A-2, B-4, C-1, D-3
The four represent the development of armour. Rock is the natural material, limited by what the quarry will yield. The cube is the simplest concrete unit, relying on its own weight rather than any interlock. The tetrapod interlocks through slender projecting legs, which is both its strength and its weakness. The Accropode is a single layer interlocking unit of high stability, requiring accurate placement but far less concrete in total.
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