Tsunamis are large waves generated by earthquakes or other disturbances that displace large volumes of water. They can reach beaches in minutes and cause extensive damage. A major 2004 tsunami in Sri Lanka killed over 40,000 people after an earthquake in the Indian Ocean. Hurricanes are violent tropical storms with winds over 74 mph that form over warm ocean waters and move westward. They can only be stopped by land or cooler waters. Floods occur when water overflows river banks or other areas, often due to heavy rain or snowmelt, and can cause billions in damage annually in the US. Drought is a period of unusually dry weather lacking precipitation that can last years and seriously damage crops and water supplies. Tornado