The document discusses electric charges and lightning. It defines electric charges and how they are created through friction between objects. Positively charged objects attract negatively charged objects and like charges repel. Lightning is formed when positive and negative charges build up within storm clouds and discharge through sparks. There are two types of lightning - sheet lightning occurs within a cloud, while fork lightning discharges between clouds or from clouds to the ground/buildings. The document also provides safety tips to prevent lightning injuries.