Oceanic Relief PDF

The oceanic relief  Marge passive: Passive marge- Bassin océanique: oceanic Basin marge continentale: continental marge (shelf) –talus continental: continental slope,  The oceanic relief. is also known as sea relief, underwater relief or ocean floor. Within the formations of the oc...

The oceanic relief  Marge passive: Passive marge- Bassin océanique: oceanic Basin marge continentale: continental marge (shelf) –talus continental: continental slope,  The oceanic relief. is also known as sea relief, underwater relief or ocean floor. Within the formations of the oceanic relief we find: The continental shelf: It is the region of the ocean floor closest to the coast. It consists of a flat extension and presents a slight increase in depth as it moves away from the coastline. Its level ranges between 0 and 200 meters below the sea surface. Most of the marine plant and animal species are found in this area.  The Continental Slope (pente continentale ou Talus continental). It involves a sharp decline or descent between the continental shelf to levels between 3000 and 4000 meters deep. It is the zone of sediment precipitation, which is controlled by gravity,. Continental Rise (Glacis continental):The more gradual transition to the abyssal plain is a sediment-filled region called the continental rise. -The continental shelf, slope, and rise are collectively called the continental margin  Underwater basins. It is a large depression in the land surface of the ocean floor, it is logically occupied by the ocean, whose types of reliefs fundamental are the following: Abyssal plains. Extensive flat areas formed by sediments of continental origin. Ocean trenches (Fossés ou fosses océaniques )They are long and narrow (etroites) depressions, where the plates of the lithosphere are destroyed by subduction. When two plates of the Earth's crust collide, the oceanic plate, which is the densest, is placed under the continental plate, which is less dense, giving rise to trenches and areas of seismic activity.  Oceanic ridges. (dorsales océaniques) Cordiller (chaine de montagne etroite )as formed on the ocean floor around a bottom of expansion, when two plates separate, a fissure opens through which the magmatic material rises and a symmetry that becomes a center is created on both sides of the center of the fissure. In these ridges there is, therefore, great volcanic and seismic activity. Sea Mountains. Volcanic hills The seamounts are elevations of the seabed, of volcanic origin that reach up to 1000 meters above said bottom..