Question

What is meant by Salt brines and Geothermal Vents

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Answer 1

Brine, salt water, particularly a highly concentrated water solution of common salt (sodium chloride). Natural brines occur underground, in salt lakes, or as seawater
If you want to make pickles, you have to soak cucumbers in brine for several days or even weeks before canning them.

Geo thermal vent refer to opening in the earth surface from the inner surface of earth(mantle of earth)
A volcano is a geothermal vent at the Earth's surface through which magma (molten rock) and associated gases erupt, and also the cone built by eruptions