Neither crusts is heavier or thicker than the other so the plates collide and create fold mountains. Two continental plates are pushed together by convection currents. Earthquakes are also created at this plate boundary as friction builds up when the oceanic plate moves underneath the continental plate. Eventually the sea water will turn into steam and this makes the volcano very explosive. This means that it will rise up through the continental plate to form a volcano. It also take sea water down with it which, when combined with the magma, makes it less dense than the mantle. As it is subducted into the mantle the oceanic crust melts to form new magma. When a oceanic plate and a continental plate move together the oceanic plate is subducted (forced down) as it is denser. Earthquakes are also created when friction builds up as the plates move over the mantle.Īt destructive plate margins the convection currents converge and two plates move together.
This process repeats itself and over time a volcano is created. When the magma reaches the surfaces it cools and solidifies to form oceanic crust. As the two plates move apart magma rises up from the mantle. At this type of plate boundary the convection currents diverge and the two plates move apart.
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