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.
Home > Aldabra > Overview. Aldabra atoll is 400 km from the nearest mainland. There is little soil, practically no fresh water, no guano, no phosphate, no deep-water anchorage. The jagged coral can quickly tear shoes, and feet, to ribbons. The atoll is an inhospitable and even dangerous place. And therein lays its value to science.