Term: Hadal zone
Origin: Anc Greek
>αΐηδηλος/aidilos(=unseen, unknown) > α(=(privative, “non”) +ιδείν/idein(=seen)
ζώννυμι/zonimi(=gird) >ζώνη/zone(=belt)
Definition
The Hadal zone is the deepest portion (zone) of ocean with a depth of around 6,000 metres (20,000 ft) to the bottom of the ocean. This region is defined by complete darkness, high pressure, and average temperatures of 2-3 degrees C (35 degrees F). Just above the hadal zone is the abyssal zone.
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