Although to some extent the soluble waste of rocks is washed down surface slopes by the rain, by far the larger part is carried downward by ground water and is delivered to streams by springs.
Ground water is held at its height by the fact that its circulation is constantly impeded by capillarity and friction.
By studying a spring one may learn much of the ways and work of ground water.
The ground-water surface= is the name given the upper surface of ground water, the level below which all rocks are saturated.
Moreover, ground water at shallow depth in the underlying sandstone has encouraged the growth of exceptionally large piñon and juniper trees that provide welcome shade.
Ground water, found everywhere in rock openings at differing depths beneath the surface, contains considerable dissolved carbon dioxide derived from decaying organic matter in soil, from the atmosphere, and from other sources.
This stretch of the wash cuts through an intruded block of the Paradox Member of the Hermosa Formation consisting mainly of gray and brown gypsum, the common salt having been dissolved out by ground water.
Ground water, found everywhere in rock openings at different depths beneath the land surface, contains dissolved carbon dioxide derived from decaying organic matter in soil, from the atmosphere, and from other sources.
Caprock consists of gypsum and shale, from which common salt has been leached by ground water, covered by alluvium.
Of the moisture precipitated from the atmosphere, that portion which neither evaporates into the air nor runs off upon the surface, sinks into the ground and is described as the ground water.
Often for a year or more there is no rainfall upon the loose sand or porous clay, and the few plants which survive must push their roots deep down until they have reached the zone of ground water.
Principles and Conditions of the Movements of Ground Water, 19th Ann.
Yet close at hand lie masses of débris into which wells may be carried to depths of more than six hundred feet without encountering either solid rock or ground water.
By subsoil drainage it is possible to lower the level of ground water wherever it is near or at the surface, as in swamps, marsh, and other lands, and prepare lands previously uninhabitable for healthy sites.
The Water of Springs The water of springs is subterranean, or ground water, which for geological reasons has found a natural outlet on the surface.
The vertical motion of the ground water is to and from the surface, and is due to the amount of rainfall, the pressure of tides, and water courses into which the ground water drains.
When rain falls, it dissolves substances floating in the atmosphere, and when it sinks into the ground and becomes ground water, it dissolves material out of the rock which it encounters (Fig.
Rain water, coming as it does from the clouds, is free from the chemicals gathered by ground water, and is hence practically pure.
The real activity of ground water is due to its great solvent power; every time we put sugar into tea or soap into water we are using water as a solvent.
Illustration: The "duck" results from irregular resistance of the limestone to solution by ground water.
Because of the pressure of water entering the rock, ground water tends to move horizontally along bedding planes which offer the easiest exit.
The ultimate source of all of Florida's ground water is from the rain and precipitates from the air.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "ground water" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
