by C. W. Fetter
Fourth Edition, Prentice Hall, New Jersey, 2001
Chapter 6: Soil Moisture and Ground-Water Recharge
"The uppermost layer of the earth may contain a three-phase system of solid,
liquid, and gaseous material. The solid phase contains mineral grains and
organic matter. The organic matter represents the remains of plans and animals
that are undergoing decay. The liquid phase is water containing dissolved solutes.
The vapor phase includes water vapor and other gases that may not be present in the same
proportions as the atmosphere (Jury, Gardner, & Gardner 1991)."
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