GEOLOGY

Detailed explanation-1: -Subduction is a geological process in which the oceanic lithosphere and some continental lithosphere is recycled into the Earth’s mantle at convergent boundaries .

Detailed explanation-2: -Older oceanic crust, which is more dense than continental crust, has long since been recycled in the process of subduction.

Detailed explanation-3: -Subduction occurs when two plates collide at a convergent boundary, and one plate is driven beneath the other, back into the Earth’s interior. Not all convergence leads to subduction. Continental rocks are too buoyant to be forced downward, so when continents collide, they crumple but stay at the surface.

Detailed explanation-4: -Some water-bearing minerals break down in subduction zones and release water, which causes melting in the hot mantle rocks above. This melted rock rises, erupts at volcanoes, and releases gases to the atmosphere. The elements in these materials then return to the ocean and oceanic crust, and the cycle repeats.