Why doesn't air/oxygen travel more than 1500 ft below surface?

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 Country: USA
Area of science: Earth Sciences
ID: 1003516679.Es

Message:


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 
1500 feet?

Re: Why doesn't air/oxygen travel more than 1500 ft below surface?

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