Question

In oceanic-continent convergence, the lower density continental plate is subducted beneath the oceanic plate...


In oceanic-continent convergence, the lower density continental plate is subducted beneath the oceanic plate

Answer

The earth is divided into crust, mantle, and core. The outermost part of the earth is the crust. It is in solid-state. It is divided into two parts- oceanic crust and the continental crust. The Conrad discontinuity separates the continental crust and the oceanic crust.

The continental crust is made up of granodiorite. Mountains and the cratons are made up of it. The oceanic crust is the one over which the ocean flows. The oceanic crust is made up of basalt, which consists of iron and magnesium. The continental crust is made up of silicates. The continental crust density is 2.7gm/cc, and the density of oceanic crust is 3 gm/cc. Therefore oceanic crust lies at a lower depth than the continental crust. When subduction occurs, the high-density oceanic crust subducts beneath the continental crust.

Hence the statement’ in oceanic- continent convergence, the lower density continental plate is subducted beneath the oceanic plate’ is not justified.

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