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When there is an explosive volcanic eruption a large amount of material is thrown up into the air in an eruptive plume or column, made up of tiny rock fragments and very hot gases. The material is initially thrown upwards by the force if the explosion, but it keeps rising and stays airborne for a long time... so what stops it falling down?
In this experiment you can create your own eruptive column in a fish tank and find out what it is that makes it rise.
Download the instructions and information sheet
