Residence time of water
This graph shows the average residence time for water molecules in the earth's water reservoirs. Most of the earth's water is unavailable for use because it is locked in ice, beneath the ground, or in the oceans.
Source
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"OpenStax College, Biogeochemical Cycles. October 17, 2013."
http://cnx.org/content/m44889/latest/Figure_46_03_02.jpg
OpenStax CNX
CC BY 3.0.
