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'Lab volcano' produces lightning

Researchers in Munich are using a "volcano in the lab" to investigate the spectacular lightning often observed in eruption plumes.

The hope eventually is to learn something about the nature of volcanoes from just their lightning behaviour.

Corrado Cimarelli from the Ludwig Maximilian University of Munich described the phenomenon of volcanic lightning to our correspondent Jonathan Amos.

Go to next video: 'Lab volcano' experiment footage