Electrons.
An electrical discharge is lightning. The air around lightning may reach 30,000°C (54,000°F) in only one lightning strike! As a result of this intense heating, the air rapidly expands explosively. The expansion generates a shock wave, which develops into the thunderous sound wave.
High in a thunderstorm, ice crystals collide as they drift up and down in the tumultuous air.
As they collide with one another, ice crystals are knocked off and added to by tiny, negatively charged particles known as electrons. This divides the cloud's positive (+) and negative (-) charges. The base of the cloud becomes negatively charged, while the top of the cloud becomes positively charged with protons.
Positive charge is carried into the cloud by a powerful electric current that forms at the point where the stepped leader and positive charge collide. The return stroke is the name given to this electric current.
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