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.
The character-driven toon chronicles the nautical and sometimes nonsensical adventures of SpongeBob, an incurably optimistic and earnest sea sponge, and his undersea friends. Dwelling a few fathoms beneath the tropical isle of Bikini Atoll in the sub-surface city of Bikini Bottom, SpongeBob lives in a two-story pineapple.