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    Mar 7, 2007, 11:47 AM
    Residence time
    how do you determine the residence time of calcium using the following information?

    concentration of calcium ion in sea water:.40 G/KG
    Mass of sea water in oceans:1.4 x 10^21 kg
    average salinity of river water: .12 g/kg
    annual river run off:3.6 x 10^16 kg/yr

    Please help ASAP

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