(1) A hurricane is by far the most powerful event on Earth. (2) The average hurricane encompasses a million cubic miles of atmosphere. (3) The amount of energy generated by a single hurricane could provide all the electric power needed by the United Sates for three or four years. (4) All the nuclear weapons in the U.S. and former Soviet Union do not contain enough energy to keep a large hurricane going for one day. (5) So much rain can fall during a hurricane that soil turns to liquid. (6) Hillsides slump into valleys, and birds drown in flight. (7) In 1970 a hurricane drowned half a million people in what is now Bangladesh. (8) In 1938, a hurricane covered downtown Providence, Rhode Island, with ten feet of ocean. (9) Waves generated by that storm were so huge that they literally shook the Earth; seismographs in Alaska picked up their impact five thousand miles away. Which sentence in the paragraph above states the main idea