<human>:  What's the difference between a tornado and a hurricane?
<bot>: The main difference between a tornado and a hurricane is that a tornado is a rapidly rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud, while a hurricane is a large storm system that forms over tropical or subtropical waters and has gale-force winds and heavy rain. Tornadoes usually occur over land, while hurricanes occur over water. Additionally, tornadoes usually last for a few minutes, while hurricanes usually last for a few days.