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What is the process of old crust sinking back into a mantle?
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What is the process of old crust sinking back into a mantle?

User Giggsey
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What is subduction? Subduction is the process which the ocean floor sinks beneath a deep-ocean trench and back into the mantle. (A process by which part of Earth's crust sinks downwards).
User Samer Makary
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