Discussion
On the basis of depths arrange the deep sea trenches in descending order :
(1) Tonga trench
(2) Aleutian trench
(3) Peru Chile trench
(4) Japan trench
Answer: D
The descending order is 1 - 4 - 3 - 2: Tonga, Japan, Peru-Chile, Aleutian.
Approximate maximum depths, as usually quoted:
- Tonga trench: about 10,800 m, the second deepest in the world after the Mariana trench.
- Japan trench: about 8,400 m.
- Peru-Chile (Atacama) trench: about 8,000 m.
- Aleutian trench: about 7,700 m.
Exact figures vary between sources, but the order is the same. Option A puts the Peru-Chile trench ahead of the Japan trench, and options B and C put the shallow Aleutian or the Japan trench ahead of the Tonga trench, which is far deeper than all three.
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