TRENCHES

• DEEP DEPRESSIONS RIMMING THE PACIFIC OCEAN MOSTLY

• SUBDUCTION ZONES

• CURVING CHAINS OF V-SHAPED INDENTATIONS

• CURVED DUE TO GEOMETRY OF PLATE INTERACTION ON A SPHERE

• CONVEX SIDE TO OCEAN

• TRENCH WALL ON ISLAND SIDE

• ASSOCIATED WITH AN ISLAND ARC

• LONG, NARROW

• 34,000 feet DEEP

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