![]() Constructive plate marginsĪt a constructive plate margin the plates move apart from one another. Earthquakes can occur at collision margins. ![]() If two continental plates collide, neither can sink and so the land buckles upwards to form fold mountains. The volcanic eruptions are often violent, with lots of steam, gas and ash. The magma escapes through weaknesses in the rock and rises up through a composite volcano. The pressure of the magma builds up beneath the Earth's surface. When the plate sinks into the mantle it melts to form magma. This happens because the oceanic plate is denser (heavier) than the continental plate. ![]() The plates move towards one another and this movement can cause earthquakes.Īs the plates collide, the oceanic plate is forced beneath the continental plate. Destructive, constructive and conservative plate margins Destructive plate marginsĪ destructive plate margin usually involves an oceanic plate and a continental plate.
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