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Free text: {{Conceptshowvalues}} The definition does not include the height reached by a reef or other biogenic structure e.g. horse mussel sits only a few cm above the substratum, while a horse mussel reef can be several metres high and extend for several kilometres. However, an individual colony of the coral water coral ''Lophelia'' can be several metres high and across, and the reef can be several metres high and extend for many kilometres. Descriptor expressed as either the minimum, maximum or average value in millimeter, centimeter, meter. {{Missingproperty}}
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