abyssal sediments

См. также в других словарях:

• abyssal zone — n. the ecological zone along the deep ocean floor between the bathyal and hadal zones * * * ▪ geology       portion of the ocean deeper than about 2,000 m (6,600 feet) and shallower than about 6,000 m (20,000 feet). The zone is defined mainly by… …   Universalium

• abyssal — abyssal, ale, aux [ abisal, o ] adj. • 1885; « dont l immensité est insondable » théol. 1521; du lat. abyssus « abîme » ♦ Géogr. Des grandes profondeurs, qui a rapport aux abysses. ⇒ hadal. Fosses abyssales. Faune abyssale. ⇒ pélagique. ● abyssal …   Encyclopédie Universelle

• Abyssal plain — Abyssal plains are flat or very gently sloping areas of the deep ocean basin floor. They are among the Earth s flattest and smoothest regions and the least explored. Abyssal plains cover approximately 40% of the ocean floor and reach depths… …   Wikipedia

• Abyssal fan — Abyssal Fans, also known as deep sea fans, underwater deltas, and submarine fans, are underwater structures that look like deltas formed at the end of many large rivers, such as the Nile or Mississippi Rivers. Abyssal fans are also thought of as… …   Wikipedia

• abyssal hill — ▪ geology       small, topographically well defined submarine hill that may rise from several metres to several hundred metres above the abyssal seafloor, in water 3,000 to 6,000 m (10,000 to 20,000 feet) deep. Typical hills have diameters of… …   Universalium

• abyssal plain — Flat seafloor area at a depth of 10,000–20,000 ft (3,000–6,000 m), generally adjacent to a continent. The larger plains are hundreds of miles wide and thousands of miles long. The plains are largest and most common in the Atlantic Ocean, less… …   Universalium

• abyssal plain —   large, relatively flat areas of ocean floor found at 5,000 6,000m below sea level. If sediments are discharged from a river and deposit relatively quickly onto the plain they may form an abyssal fan …   Geography glossary

• abyssal plain — noun : any of the great flat sediment covered areas of ocean floor * * * abyssal plain, a deep, extremely level undersea plain, such as the plain lying about 750 miles to 1,000 miles off the eastern coast of North America, with deposits of clay,… …   Useful english dictionary

• Pelagic sediments — Pelagic sediment or pelagite is a fine grained sediment that has accumulated by the settling of particles through the water column to the ocean floor beneath the open ocean far from land. These particles consist primarily of either the… …   Wikipedia

• Colombian Abyssal Plain — ▪ plain, Caribbean Sea       submarine plain forming part of the floor of the south central Caribbean Sea, and the deepest and flattest portion of the Colombian Basin. It rises to the southeast to form the Caribbean coast of Colombia, joins the… …   Universalium

• Cône sous-marin ou abyssal — ● Cône sous marin ou abyssal amas de sédiments en forme d éventail élargi vers le bas, édifié au débouché d un cañon sous marin …   Encyclopédie Universelle