Hadal zone

Term: Hadal zone

Origin: Anc Greek

Άδης/Hades (=ancient Greek underworld or the god of the underworld)

>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.