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The total volume of both freshwater and seawater on Earth is estimated to be about 1.386 x 10^9 km^3. What fraction of the Earth's mass does the water constitute? The Earth's mass is about 5.972 x 10^24 kg. Express your answer as a common fraction? Thanks for help.

 Oct 2, 2018
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1 km^3=1 x 10^12 liters

1 liter = ~ 1 kg of water.

[1.386 x 10^9] x 10^12 =1.386 x 10^21 kg - total weight of  water on Earth.

[1.386 x 10^21] / [5.972 x 10^24] =0.000232 = ~ 1/4,309 of the the Earth's mass.

 Oct 2, 2018

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