Thunder

From Wikipedia, a free encyclopedia written in simple English for easy reading.

Thunder is a very loud sound which sometimes is made during a very big rain storm. Thunder is so loud that you can hear it from a very far distance. It can sound like a boom, a crash, or a rumble.

Thunder is made when lightning strikes. The energy from the lightning heats up the air so much that it makes a kind of explosion.

If lightning is very near, you hear thunder soon after seeing the lightning flash and the sound will be very loud. If the lightning is far away you hear the thunder a few seconds or many seconds after seeing the lightning. People can decide how far away the lightning happened by the time number of seconds between seeing the lightning and hearing the thunder.