Thunder is the loud booming and crashing sound which is made by lightning

Thunder is the loud booming and crashing sound which is made by lightning. Thunder always comes after lightning, without lightning there is no thunder. Lightning is the very large spark that obstacles from cloud to cloud or from the ground to a cloud. Thunder is caused by a sonic shock wave which lightning creates.
Beliefs about thunder included that it occurred before lightning is, it also is believed that thunder and lightning is caused by the collision of clouds. The sound of the thunder is believed to be produced by reverberation between low and high clouds, and by high clouds descending and colliding onto lower clouds.