Sand devil length and at least in weight. The sand devil is found in the northwestern Atlantic Ocean from Massachusetts to the Florida Keys, where it is fairly common. It also occurs in the northern Gulf of Mexico, and there are additional unconfirmed records from Cuba, Jamaica, Nicaragua, and Venezuela. The southern extent of its range is uncertain due to confusion with the disparate angelshark ("S. heteroptera") and Mexican angelshark ("S. mexicana"). This bottom-dwelling shark is found over sandy or muddy bottoms on the continental shelf and slope. Off the eastern United States, the sand devil has been documented to migrate seasonally.
Ocean island basalt Ocean island basalt Ocean island basalts (OIB) are basaltic rocks found on many volcanic islands away from tectonic plate boundaries, typically associated with hot spots. Ocean island basalts are found on islands and volcanoes located on oceanic crust. The chemical composition of these basalts can vary from tholeiite to alkali basalt within the same island group, but it is never calc-alkaline. During the shield volcano stage of many hotspot islands, tholeiitic OIBs build up most of the volcano's structure. Following the post-erosional stage this is usually accompanied by violent eruptions of alkali basalt and other more evolved volcanic rocks with