General Information    US Geological Survey
                                            Red Cross

Earthquakes                USGS - Science For Changing Worlds
                                           USGS
                                           Exploratorium

Tsunamis                USGS - Science For Changing Worlds
                                           National Weather Service
                                           PBS Online

Volcanoes                   USGS - Science For Changing Worlds
                                           USGS - Cascades Volcano Observatory
                                           Learner Interactive Volcanoes
                                           Volcanoes

Tornadoes                   NOAA Online Tornado Facts
                                            NSSL - NOAA Tornado Facts
                                            USA Today
                                            FEMA

Floods                         Johnstown Flood 1889
                                            The Great Flood of 1993
                                            The Great Dayton Flood of 1913 (1)
                                            The Great Dayton Flood of 1913 (2)
                                            The Great Floods o f 1927 and 1993

Blizzards                           The Blizzard of 1949
                                            The Blizzard of 1888 - The Great White Hurricane
                                            The Blizzard of 1977
                                            The Blizzard of 1978 (1)
                                            The Blizzard of 1978 (2)
                                            The Blizzard of 1993 (1)
                                            The Blizzard of 1993 (2)