Sakurajima Volcano with Lightning
Why does a volcanic eruption sometimes create lightning? Pictured above, the is even less clear. Surely, lightning bolts help quench areas of opposite but separated electric charges. Volcanic lightning episodes may be facilitated by charge-inducing collisions in volcanic dust. Lightning is usually occurring somewhere on Earth, typically over 40 times each second.
May 13, 2018
via NASA https://apod.nasa.gov/apod/ap180513.html