divingin
Gold $$ Contributor
And a spot up in northern California (I don't remember the locale) that is leaking a bunch of carbon dioxide and hydrogen sulfide. I saw a program about it a while back, it was killing ALL the vegetation in the surrounding area. They did air analysis of the surrounding area and it showed normal levels, ground concentration levels were 10+ times what they should have been.
CO2 and H2S are normal products of volcanic activity (and other processes.) Anyplace with active volcanic processes will have elevated levels of both. Both are heavier than air, so will tend to pool at ground level in depressions.











