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Q&A Is it feasible to break rock into core components?

In the near future, the last of the human race has been forced to retreat underground due to extreme global warming or some solar flare event. Vertical hydroponic farms provide the food for the s...

3 answers  ·  posted 9y ago by QuiquÈ…‭  ·  last activity 9y ago by QuiquÈ…‭