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===About Volcanoes===
: [[Volcano]]es are usually found near the boundaries between [[Tectonic Plate|tectonic plates]].
Once a volcano is formed it goes through 3 stages of existence :
: 1. Firstly as a volcano is [[Volcanic Eruption|erupting]] it is known as an [[Active Volcano]].
: 2. Secondly when a volcano is not currently erupting but is due to erupt again within a period of ten thousand years since its last eruption it is known as a [[Dormant Volcano]].
: 3. Finally if a volcano has not erupted in over 10,000 years it is classified as an [[Extinct Volcano]]. This means that it will never erupt again.
==Key Stage 4==
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]] forms in 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 an extremely violent [[Volcanic Eruption]] is created due to high [[pressure]] that built up as the [[magma]] moved through the [[vents]] being 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.
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=yDy28QtdYJY}}