A.He is incorrect. Mid-ocean ridges are sites of frequent volcanic activity.
B.He is incorrect. Mid-ocean ridges are sites of divergent oceanic plates.
C.He is correct. Mid-ocean ridges are flat areas at the foot of continental shelves.
D.He is correct. Mid-ocean ridges are ancient volcanoes whose tops have eroded away.
The correct option is D.
Mid ocean ridges refers to an underwater mountain system that is formed by plate tectonic.Mid ocean ridges are formed when convention current arise in the mantle under the oceanic crust and from a magma,where two tectonic plates come together at aboundary
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