Taal volcano eruption: What causes RARE volcanic lightning? | World | News

In a storm cloud, negative charges develop in the top, and positive charges at the bottom, leading electricity to flow between the layers as lightning.

The process of lightning formation in a volcano is less understood, and scientists are locked in debate as to what exactly causes the phenomenon.

Some scientists are united in the belief that lightning charges via the process of ash and debris moving through the atmosphere.

Once electrical charges separate over a significant distance (not difficult for volcanoes which spew ash thousands of metres into the sky) lightning arcs between them.

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