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.
Reef-building corals will thrive only in warm tropical and subtropical waters of oceans and seas, and therefore atolls are only found in the tropics and subtropics. The northernmost atoll of the world is Kure Atoll at 28Â°24' N, along with other atolls of the Northwestern Hawaiian Islands.he next southerly atoll is Ducie Island in the Pitcairn Islands Group, at 24Â°40' S. Bermuda is sometimes claimed as the northernmost atoll at a latitude of 32Â°24' N. At this latitude coral reefs would not develop without the warming waters of the Gulf Stream.