What direction of motion of the plates that form cascade volcanoes? ?

A dense oceanic plate plunges beneath the North American plate (subduction). As the oceanic plate sinks down beneath the Earth's interior, beneath the continental plate, high temperatures and pressures allow water molecules locked in the minerals of solid rock to escape. The water vapor rises to the pliable mantle above the subducting plate causing some of the mantle to melt.

Ithink its convection.hope this plz give brainliest!

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