Match these items. 1. isostasy subduction 2. deepest ocean depths fjord 3. drowned glaciated valley trench 4. theory of crustal structure plate tectonics 5. oceanic plate going down buoyancy
i pick 4. theory of crustal structure plate tectonics.
1. buoyancy
2. trench
3. fjord
4. plate tectonics
5. subduction
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