Hey Rosie, want to see a cool trick I learnt in science class?
See, your hair is sticking up from the electrostatic force of the balloon.
We should go to class now.
The bell rings*****
Flashback to Science Class......
There are two types of charges, negative and positive charge. If two charges come together (e.g negative and positive) the two charge attaches or repulse each other. The repulsion and attraction act between two charges.
Lightning is caused because if the changes are strong enough at the bottom of the cloud a jolt of energy comes out. The negative charges normally are at the bottom of the cloud and the top of the cloud has most of the positive charge.