Landforms are categorized by characteristic physical attributes such as their creating process, shape, elevation, slope, orientation, rock exposure, and soil type.
A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an island is known as an insular shelf.
The seabed is the bottom of the ocean. All floors of the ocean are known as 'seabeds'.
The Aurantimonadaceae are a small family of marine bacteria.
Kaikō was a remotely operated underwater vehicle (ROV) built by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) for exploration of the deep sea. Kaikō was the second of only five vessels ever to reach the bottom of the Challenger Deep, as of 2019. Between 1995 and 2003, this 10.6 ton unmanned submersible conducted more than 250 dives, collecting 350 biological species, some of which could prove to be useful in medical and industrial applications. On 29 May 2003, Kaikō was lost at sea off the coast of Shikoku Island during Typhoon Chan-Hom, when a secondary cable connecting it to its launcher at the ocean surface broke.
A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to 5 km (3 mi), from canyon floor to canyon rim, as with the Great Bahama Canyon. Just as above-sea-level canyons serve as channels for the flow of water across land, submarine canyons serve as channels for the flow of turbidity currents across the seafloor. Turbidity currents are flows of dense, sediment laden waters that are supplied by rivers, or generated on the seabed by storms, submarine landslides, earthquakes, and other soil disturbances. Turbidity currents travel down slope at great speed, eroding the continental slope and finally depositing sediment onto the abyssal plain, where the particles settle out.
Sapropel is a term used in marine geology to describe dark-coloured sediments that are rich in organic matter. Organic carbon concentrations in sapropels commonly exceed 2 wt.% in weight.
Campylobacterota are a phylum of Gram-negative bacteria. Only a few genera have been characterized, including the curved to spirilloid Wolinella, Helicobacter, and Campylobacter. Until the 2021 revision of bacterial taxonomy by the ICSP, the entire phylum was classified within the Proteobacteria as the Epsilonproteobacteria.
Marine sediment, or ocean sediment, or seafloor sediment, are deposits of insoluble particles that have accumulated on the seafloor. These particles either have their origins in soil and rocks and have been transported from the land to the sea, mainly by rivers but also by dust carried by wind and by the flow of glaciers into the sea, or they are biogenic deposits from marine organisms or from chemical precipitation in seawater, as well as from underwater volcanoes and meteorite debris.
ABISMO is a remotely operated underwater vehicle (ROV) built by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) for exploration of the deep sea. It is the only remaining ROV rated to 11,000-meters, ABISMO is intended to be the permanent replacement for Kaikō, a ROV that was lost at sea in 2003.
Aggregata is a genus of parasitic alveolates belonging to the phylum Apicomplexa.
Aurantimonas coralicida is a gram-negative bacterium, and a causative agent of white plague in Caribbean corals. It is rod-shaped, with polar flagella.
Aureimonas altamirensis is a Gram-negative, catalase- and oxidase-positive, non-motile bacteria from the genus Aurantimonas which was isolated from Altamira Cave in Cantabria in Spain. Aurantimonas altamirensis was reclassified to Aureimonas altamirensis.
Aurantimonas manganoxydans is a Gram-negative, catalase- and oxidase-positive, non-spore-forming, motile bacteria from the genus of Aurantimonas which has the ability to oxidize Manganese. Aurantimonas manganoxydans was isolated from coastal water from Oregon in the United States.
Aureimonas frigidaquae is a Gram-negative, catalase- and oxidase-positive, facultatively anaerobic bacteria from the genus of Aurantimonas which was isolated from a water-cooling system in Gwangyang in the Republic of Korea. Aurantimonas frigidaquae was reclassified to Aureimonas frigidaquae.
Streptomyces nanhaiensis is a bacterium species from the genus of Streptomyces which has been isolated from deep sea sediments from the northern South China Sea in China.
Aurantimonas endophytica is a short-rod-shaped, aerobic and motile bacteria from the genus of Aurantimonas which has been isolated from the roots of the plant Anabasis elatior in Urumqi in China.
White plague is a suite of coral diseases of which three types have been identified, initially in the Florida Keys. They are infectious diseases but it has proved difficult to identify the pathogens involved. White plague type II may be caused by the gram negative bacterium Aurantimonas coralicida in the order Hyphomicrobiales but other bacteria have also been associated with diseased corals and viruses may also be implicated.
Aquimarina aggregata is a Gram-negative, strictly aerobic, rod-shaped and agarolytic bacterium from the genus of Aquimarina which has been isolated from seawater from the Yellow Sea in China.
Rubrobacter marinus is a Gram-positive bacterium from the genus of Rubrobacter which has been isolated from deep-sea sediments from the South China Sea.
