Less dense continental plate is more buoyant than the oceanic plate, More dense oceanic plate is subducted below the continental plate, More dense oceanic plate is subducted by slab pull below the continental place, Subduction zone - Sinking ocean plate pulls oceanic crust down, this is slab pull, Less dense magma bubbles force back up through the crust, Ocean trench - a depression running parellel with the coastline, Less dense continental crust crumples and mountains form, Magma rises through the vent and erupts explosively, As oceanic plate descends, silica-rich minerals release water and carbon dioxide, reducing melting point, creating magma at subduction zones.

Processes at destructive plate boundaries

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