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Starts by asking why the volcanic ash from the Eyjafjallajoekull eruption in Iceland caused such problems for aviation. This is followed by the theory of a phreatomagmatic eruption in which molten magma hits an ice cap. The resulting rapid cooling of the magma creates shockwaves which create very fine dust which rises high into the atmosphere.
Clip 38 from the Bang Goes the Theory teachers pack. To download the pdf please go to bbc.co.uk/schools/teachers/bang/
A high level description of a volcanic eruption. A real life example of the effects of rapid cooling of hot objects.
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