KBC 13: Brine pools in the ocean have an unusually high level of what?

KBC Offline Quiz (November 22, 2021): Brine pools in the ocean have an unusually high level of what?

Corals

Hydrogen

Salt

Sulphur

Answer: Salt

Brine pools
are created through three primary methods: brine rejection below sea ice,
dissolution of salts into bottom water through salt-tectonics, and geothermal
heating of brine at tectonic boundaries and hot spots.

A brine
pool, sometimes called an underwater, deepwater or brine
lake, is a volume of brine collected in a seafloor depression. The
pools are dense bodies of water that have a salinity that is three to
eight times greater than the surrounding ocean. Brine pools are commonly found
below polar sea ice and in the deep ocean. Those below sea ice form through a
process called brine rejection. 

For deep-sea
brine pools, salt is necessary to increase the salinity gradient. The salt can
come from one of two processes: the dissolution of large salt deposits
through salt tectonics or geothermally heated brine issued from
tectonic spreading centers. The brine often contains high concentrations
of hydrogen sulfide and methane, which provide energy to chemosynthetic organisms
that live near the pool. These creatures are often extremophiles and symbionts.

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