Fill in the blanks to complete the passage. Through the process of

, old, dense crust is pushed toward a deep-ocean

. There, it sinks under lighter crust. It returns to molten rock, becoming part of the

again.

Through the process of  subduction , old, dense crust is pushed toward a deep-ocean trench . There, it sinks under lighter crust. It returns to molten rock, becoming part of the mantle  again.

Explanation:

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step-by-step explanation:

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