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  2. Hydrothermal vent - Wikipedia

    en.wikipedia.org/wiki/Hydrothermal_vent

    Hydrothermal vents exist because the Earth is both geologically active and has large amounts of water on its surface and within its crust. Under the sea, they may form features called black smokers or white smokers, which deliver a wide range of elements to the world's oceans, thus contributing to global marine biogeochemistry .

  3. Marine ecosystem - Wikipedia

    en.wikipedia.org/wiki/Marine_ecosystem

    From shallow waters to the deep sea, the open ocean to rivers and lakes, numerous terrestrial and marine species depend on the surface ecosystem and the organisms found there. [28] The ocean's surface acts like a skin between the atmosphere above and the water below, and harbours an ecosystem unique to this environment.

  4. Deep-sea community - Wikipedia

    en.wikipedia.org/wiki/Deep-sea_community

    Pelagic zones. The ocean can be conceptualized as being divided into various zones, depending on depth, and presence or absence of sunlight.Nearly all life forms in the ocean depend on the photosynthetic activities of phytoplankton and other marine plants to convert carbon dioxide into organic carbon, which is the basic building block of organic matter.

  5. Hadal zone - Wikipedia

    en.wikipedia.org/wiki/Hadal_zone

    The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches.The hadal zone ranges from around 6 to 11 km (3.7 to 6.8 mi; 20,000 to 36,000 ft) below sea level, and exists in long, narrow, topographic V-shaped depressions.

  6. Thermocline - Wikipedia

    en.wikipedia.org/wiki/Thermocline

    Artificial upwelling – Oceanographic phenomenon of wind-driven motion of ocean water; Buoyancy – Upward force that opposes the weight of an object immersed in fluid; SOFAR channel, also known as Deep sound channel – Horizontal layer of water in the ocean at which depth the speed of sound is at its minimum

  7. Marine biogeochemical cycles - Wikipedia

    en.wikipedia.org/wiki/Marine_biogeochemical_cycles

    Iron is a key micronutrient in primary productivity, [49] and a limiting nutrient in the Southern ocean, eastern equatorial Pacific, and the subarctic Pacific referred to as High-Nutrient, Low-Chlorophyll (HNLC) regions of the ocean. [50] Iron exists in a range of oxidation states from -2 to +7; however, on Earth it is predominantly in its +2 ...

  8. Ecosystem of the North Pacific Subtropical Gyre - Wikipedia

    en.wikipedia.org/wiki/Ecosystem_of_the_North...

    The NPSG is the largest of the open ocean habitats and is considered to be the Earth’s largest contiguous biome. [5] This great anticyclonic circulation feature extends from 15°N to 35°N latitude and from 135°E to 135°W longitude. Its surface area spans approximately 2 x 10 7 km 2. Its western portion, west of 180° longitude, has greater ...

  9. Hydrothermal vents and seamounts of the Azores - Wikipedia

    en.wikipedia.org/wiki/Hydrothermal_vents_and...

    A relief map of the Azores Triple Fault region and southern bathymetric zone. The hydrothermal vents and seamounts of the Azores (Portuguese: fontes hidrotermais e montes submarinos dos Açores) are a series of Atlantic seamounts and hydrothermal vents that are part of the Mid-Atlantic Ridge system, giving rise to the archipelago and bathymetric region of the Azores.