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A/An ____________________ ____________________ is a long narrow trough in the sea floor formed where a portion of an oceanic plate sinks into the mantle

A/An ____________________ ____________________ is a long narrow trough in the sea floor formed where a portion of an oceanic plate sinks into the mantle
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A/An ____________________ ____________________ is a long narrow trough in the sea floor formed where a portion of an oceanic plate sinks into the mantle

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User Elsa
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Answer:

steep–sided depression

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User Vignesh I
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