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.
Bikini Bottom is shown to be quite a clean city. Littering is highly prohibited, and the areas around Bikini Bottom are pristine. The only problem is that with high population and the amount of automobiles Bikini Bottom can become very smoggy, as mentioned by Sandy in The SpongeBob SquarePants Movie.