Tornado information: britannica.com:tornados © 1999-2000 Britannica.com Inc. Earthquake information: britannica.com:earthquakes © 1999-2000 Britannica.com Inc. Lightning:  britannica.com :lightning © 1999-2000 Britannica.com Inc. Huricane: beta.encarta.msn.com © 1999-2000 Britannica.com Inc. Tidal wave: beta.encarta.msn.com © 1999-2000 Britannica.com Inc. Graphics: flamingtext.com animationlibrary.com cooltext.com altavista.com