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XML
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Codet
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Inclination
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Achene
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Prognosis
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Ecological continuum
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Map projection
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Noctilucent cloud
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Gingivitis
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Giant sequoia
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VBR
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Oxidase
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Imago
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Compost
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Glycopeptide
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Opt-in
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Osteoblast
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Eisenmenger complex
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Oligocene
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Homeplug
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Exocytosis
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Meteorite swarm
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Potential energy
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Integrated surface coating
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Mango
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Forestry
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Nictitating membrane
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Severe persistent asthma
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Plutoid
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Transpiration
Hadal zone
The hadal zone refers to the oceanic trenches and ravines over 5,000 metres deep.
Characteristics of the hadal zone
At these depths, there is no light and the pressure is very high. Organisms that live in this aphotic environment are therefore extremophiles.
Very little is known about the benthofauna and hadopelagic fauna of this zone.
A three dimensional model of the oceanic trench of Puerto Rico. © Woodshole USGS, public domain
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