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Its when either on a destructive plate boundary where the oceanic plate and Continental plate move towards each other, the heavier oceanic plate sinks beneath the Continental plate then the oceanic plate melts in Subduing boundary. Or on a constructive plate boundary when the plates (North American plate and Eurasian plates) are pulled apart by convection currents and Liquid or magma rises between them, forming small volcanoes on the ocean floor. It hardens to basalt which forms the ocean floor. :D

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