Geography

Ar destrutive plate margins the oceanic plate goes under the continental plate because its more dense

the oceanic plate moves down into the mantle, where irts melted and destroyed

A pool of magma forms

The magms rises through cracks in the crust called wents

The magma erupts onto the surface

COMPOSITE VOLCANOES- made up of ash and lava thats erupted cooled and hardened into layers. The lava is usually thick and flows slowly, I t hardens quickly to form a step sided volcano