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Once a volcano is formed it goes through 3 stages of existence :
: 1. Firstly as a volcano is [[Volcanic Eruption|erupting]] or has recently erupted 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==
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=yDy28QtdYJY}}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Volcano, pages 292-3, 295-7, 315, GCSE Chemistry; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Volcanoes, pages 168, GCSE Combined Science Trilogy 2, Hodder, AQA '']