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Oceanic trench

The oceanic trenches are the deepest parts of the ocean floor, typically formed when one tectonic plate slides under another. Major world trenches include:

Aleutian Trench[?]
Cayman Trench[?]
Japan Trench[?]
Kermadec Trench[?]
Kuril Trench[?]
Mariana Trench
Middle America Trench[?]
Peru-Chile Trench[?]
Puerto Rico Trench[?]
Tonga Trench[?]

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