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When a continental plate and an oceanic plate move toward each other and collide, the edge of the oceanic plate goes down into the part of the mantle which consists of molten rocks. At a depth of 125 to 160 km below the earth's surface, the heat is so great that the rock which goes down is partially melted. This partial melting of rocks generates magma. The downgoing rocks also brings water. The other materials in the mantle interact with the water and also generate magma. Magma has lower density than the surrounding rocks. The gas from the melting rock which mixes with the magma makes it rise.
As magma rises, it melts its way through the surrounding rocks and forms a large chamber where magma is stored until it finds it way out to the earth's surface.
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