<human>: What is the difference between a typhoon, a hurricane and a tornado?
<bot>: The main difference between a typhoon, a hurricane and a tornado is that they are all different types of severe weather systems. Typhoons are tropical cyclones that form over the ocean and travel towards land, while hurricanes are tropical cyclones that form over the ocean and travel towards land. Tornadoes are rotating columns of air that form over land or water and move horizontally across the ground at high speeds.