submerged structure
21Rigs-to-Reefs — (RTR) is a nationwide program developed by the Minerals Management Service [ [http://www.gomr.mms.gov/homepg/regulate/environ/rigs to reefs/information.html] Minerals Management Service (MMS) Rigs to Reef Information] of the U.S. Department of… …
22Atolls of the Maldives — This article discusses the natural geographical atolls of the Maldives. See Administrative divisions of the Maldives for the administrative units also known as atolls. See Islands of the Maldives for individual islands that make up the… …
23fern — fernless, adj. fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a… …
24Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… …
25Wetland — For other uses, see Wetland (disambiguation). The Florida Everglades massive wetland system in the United States saw 1.7 billion gallons of fresh water flushed from it daily and pumped into the ocean following one of the most successive water… …
26Collins class submarine — HMAS Rankin, sixth submarine of the Collins class, underway in 2006 Class overview Builders: Australian Submarine Corporatio …
27Osaka Maritime Museum — Coordinates: 34°38′24″N 135°24′16″E / 34.640049°N 135.404574°E / 34.640049; 135.404574 …
28Moon pool — For the novel, see The Moon Pool. Underside of the Research Vessel Western Flyer, showing its moon pool between the two hulls. A moon pool is a feature of marine drilling platforms, drillships and diving support vessels, some …
29lighthouse — /luyt hows /, n., pl. lighthouses / how ziz/. 1. a tower or other structure displaying or flashing a very bright light for the guidance of ships in avoiding dangerous areas, in following certain routes, etc. 2. either of two cylindrical metal… …
30Microbial mat — A microbial mat is a multi layered sheet of micro organisms, mainly bacteria and archaea. Microbial mats grow at interfaces between different types of material, mostly on submerged or moist surfaces but a few survive in deserts.[1] They colonize… …
