How ocean trenches and mid-ocean ridges formed?

Explanation:

The oceanic lithosphere is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at ocean trenches. ... A process previously proposed to contribute to plate motion and the formation of new oceanic crust at mid-ocean ridges is the "mantle conveyor" due to deep convection

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answer; ///stratum basale///stratum spinosumstratum granulosumstratum lucidumstratum corneum; 2,1,5,4,3