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No (
002 ) - Leading to question named '002'
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Yes [ G ] - Leading to another questions subset of level G
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No
[ E6 ] - Links directly to factsheet for E6
Category : (A6 )Deep-sea bed
Diagram :
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Question
a31
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Characterised by chemical conditions?
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| Deep-sea habitats characterised by chemical conditions are separated (path = <strong>Yes</strong>): these include the presence of seeping or bubbling gases or liquids, hypoxic and/or anoxic conditions in the water column above and interface habitats on the deep-sea bed where reducing conditions exist, not generally associated with drastically elevated temperatures, including the carcasses of large cetaceans. | ||
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Question
a32
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Features of significant relief?
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| Habitats on the deep-sea bed are separated according to their relief: regions with significant elevation (>200 m) in relation to their surroundings (path = <strong>raised</strong>); those significantly below the deep-sea bed (such as deep ocean trenches, often greater than 6000 m depth with an active margin reduction zone) and downslope or along-slope channels on the deep-sea bed (path = <strong>lowered</strong>); and the deep-sea bed plain (path = <strong>plain</strong>). | |||
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Question
a33
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Substrate
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| Deep-sea benthic habitats are separated into those with substrates predominantly <strong>rock</strong> (or artificial hard substrates); of mixed particle size or predominantly gravel (<strong>mixed</strong>/<strong>gravel</strong>); <strong>sand</strong>; <strong>muddy sand</strong>; <strong>mud</strong>; or <strong>biogenic</strong> (e.g. coral reefs and sponge beds). | ||||||
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Green tips
The European Environment Agency (EEA) is an agency of the European Union.