Subject: Why doesn't air/oxygen travel more than 1500 ft below surface?
Date: Fri Oct 19 14:37:59 2001
Posted by Tammy
Grade level: grad (non-science)
School: No school entered.
City: Guys Mills State/Province: PA
Area of science: Earth Sciences
Earlier coal mines were only mined 1500 feet in each direction because there
wasn't any oxygen(?)beyond that point. Why is oxygen/air only gravity fed upto
Re: Why doesn't air/oxygen travel more than 1500 ft below surface?
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