



 
Don, According to Wikipedia the mean radius of the earth is r = 6371 km. Assuming the earth is a sphere you can use this value to calculate it volume in cubic kilometers using volume = 4/3 π r^{3}. Look up the height of Mount Everest in kilometers, add this to r and calculate the volume of a sphere of this radius. Subtract the two volumes to calculate the volume of water in cubic kilometers. Suppose the result is V cubic kilometers. Finally type into Google V cubic kilometers in gallons. Penny  


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