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. a) denser continental plate pushes oceanic plate down. oceanic plate melts deep in the earth, magma rises up through weak spot. b) the less dense oceanic plate subducts under the denser continental plate. subducted plate melts due to heat and pressure. melted plate, now magma, rises up to the surface. c) 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. d) the more dense oceanic plate subducts under the less dense continental plate. subducted plate melts due to heat and friction. melted plate, now magma, rises up to the surface.

D) The more dense oceanic plate subducts under the less dense continental plate. Subducted plate melts due to heat and friction. Melted plate, now magma, rises up to the surface.

D) The more dense oceanic plate subducts under the less dense continental plate. Subducted plate melts due to heat and friction. Melted plate, now magma, rises up to the surface.Explanation;

Explanation:

   Volcanoes may be formed at convergent plate boundaries or at divergent plate boundaries.

   When two tectonic plates collide, they form a convergent plate boundary. Normally, one of the converging plates that is the dense oceanic plate will move beneath the other, which is the less dense continental plate a process as subduction.

   The friction between the plates in the subduction zone as a result of constant movement, melts the Earth's crust causing the underneath rocks to turn into magma.

   The magma creates great pressure and rises towards the surface of the earth, and on reaching the surface it is called lava, and a volcano is formed.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .