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Volcanic Dust

Way back in elementary school I remember learning about "the great circle of life" where I was taught that tons of organisms, from algae to alligators, are involved in keeping an ecosystem functional. I got to thinking: for years after the shift we are going to need resources that will be replenishing and ever lasting and ample. Power, and I mean a lot of it, will be necessary because of low sunlight and lack of the "grid." Can the soot that will constantly fall from the atmosphere be used? Is sulfur a mineral used in hydroponics?

Offered by Ted.

Soot is ash (read potash). The key is the pH of the soot which would be severely affected by the other minerals and contaminants.

Offered by John.