Question

volcanoes are often formed at plate boundaries. this is a convergent plate boundary. from the choices listed, pick the correct description of what happens before the volcano forms.
the less dense oceanic plate subducts under the more dense continental plate. the subducted plate melts due to heat and pressure. the melted plate, now magma, rises up to the surface.
as the more dense oceanic plate subducts under the less dense continental plate, it pulls the front edge of the less dense plate down, creating a deep zone or oceanic trench.
the more dense oceanic plate subducts under the less dense continental plate. the subducted plate melts due to heat, friction, and dehydration. the melted plate, now magma, rises up to the surface.
the more dense continental plate pushes the oceanic plate down. the oceanic plate melts deep in the earth. magma rises up through a weak spot

Explanation:

At a convergent plate boundary with an oceanic - continental interaction, the denser oceanic plate subducts under the less - dense continental plate. The subduction process subjects the oceanic plate to high heat, friction, and dehydration, causing it to melt into magma which then rises to the surface to form a volcano.

Answer:

The more dense oceanic plate subducts under the less dense continental plate. The subducted plate melts due to heat, friction, and dehydration. The melted plate, now magma, rises up to the surface.