Changes

At [[Destructive Plate Margin]]s more [[dense]] [[Oceanic Plate|oceanic plate]] moves under the less [[dense]] [[Continental Plate|continental plate]]. As this happens the [[Oceanic Plate|oceanic plate]] is melted and a lot of [[magma]] formsin a large pool. This [[magma]] then rises towards the surface of the [[crust]] through cracks in the [[crust]] called [[vents]]. As this [[magma]] reaches the surface it creates a an extremely violent [[Volcanic Eruption]] is created due to high [[pressure]] that built up as the [[magma]] moved through the [[vents]] being relased released. Once this [[Volcanic Eruption]] had occurred the [[lava]] that was produced cools and forms [[rock]] in the form of a mountain. This is a [[Volcano]] At [[Constructive Plate Margin]]s two [[Tectonic Plate]]s are moving away from each other and this creates a very large and deep gap. [[Magma]] rises up towards the surface of the earths [[crust]] through this gap. This then causes the [[magma]] to erupt as it reaches the surface of the [[crust]]. This is a much less violent eruption as the [[magma]] has risen through a much wider gap than the size of the [[vents]] at the [[Destructive Plate Margin]] and therefore less [[pressure]] is built up and the [[volcanic eruption]] is less explosive. The [[lava]] that has erupted then solidifies into rock and a volcano is formed.