Isopycnal

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Aquatic layers
Pelagic
   Photic
      Epipelagic
   Aphotic
      Mesopelagic
      Bathyalpelagic
      Abyssopelagic
      Hadopelagic
Demersal
Benthic
Stratification
Pycnocline
   Isopycnal
   Chemocline
      Halocline
   Thermocline
      Thermohaline
Marine habitats
Lake stratification
Aquatic ecosystems
Wild fisheries

An isopycnal is a surface of constant potential density of water. In the ocean, or any other large water body, as the depth increases, so too does the density. Varying degrees of salinity and temperature act to modify the density of water, and the denser water always lies below the less dense water. Because of the action of winds and currents, isopycnals are not always level.

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