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August 1, 2015

Homework Help: physics

Posted by liz on Wednesday, August 25, 2010 at 6:17pm.

A unit of area often used in measuring land areas is the hectare, defined as 104 m2. An open-pit coal mine consumes 72 hectares of land, down to a depth of 29 m, each year. What volume of earth, in cubic kilometers, is removed in this time?

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