I forgot my password.
Don't have an account?
Where is the largest concentration of such vents, and has a study ever been commissioned as to the composition and volume of gas discharged over a period of time?
Wiki has some general information. Follow the numerous links at the bottom of their article for LOTS of information.
Interesting stuff. As well, a blog in CR4 Today's News.
I'd say Mid Atlantic Ridge
Check out the following link to determine largest concentration
http://www.pmel.noaa.gov/vents/PlumeStudies/global-hydrothermal-vent-locations.html