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Q&A Cheapest material per ton on earth?

What is the cheapest material per ton that one could purchase on our Earth in the 21st century? This could also include the cheapest material per ton to harvest so dirt may seem like the obvious an...

4 answers  ·  posted 5y ago by CodeCamper‭  ·  last activity 5y ago by CodeCamper‭

Question environment reality-check physics materials