median
don steward
mathematics teaching 10 ~ 16

Thursday 26 March 2009

space per person

the world's population is presently around 7.8 billion
[the website http://www.worldometers.info/ shows updated data as a digital display]

the average diameter of the Earth (giant blue marble) is 12,742,000 m.

water makes up 71% of the Earth's surface

how much space is this per person?


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