Literally, in order for a vortex to be classified as a tornado, it must be in contact with the ground and the cloud base. Weather scientists haven't found it so simple in practice, however, to classify and define tornadoes (per this essay by Doswell).
Bikini Island, 2015. Credit: Emlyn Hughes. (Phys.org)âA team of researchers from Columbia University in New York has found that all of the Marshall Islands involved in nuclear tests by the U.S. are now habitable, except for Bikini Atoll.
Snorkelling on the Similan Islands is a safe, interesting, and relaxing experience, provided a few basic rules are followed. The points below are the things we discuss in all our pre-snorkel safety briefings, and we offer them here in the interest of safe snorkeling for everybody. If you have other questions please refer to our snorkeling FAQâs. Simply relax and move slowly. Marine life is less threatened by a relaxed snorkeler. Swimming slowly is not only more comfortable for you, but also is less likely to intimidate the wildlife we have all come to observe.