|Aquifers||8||0.6||2 wks-104 yr|
|Soil Moisture||0.1||0.01||52 days|
After Graedel, T. E. and P. J. Cruzen, Atmospheric Change. An Earth System Perspective, W. H. Freeman and Company, 1993.
According to Ward and Brownlee, the abundance of water is about a half of one percent by weight of the Earth. Though a small percentage, this is a very high percentage of water compared to other rocky planets.