Fresh Water - Source

Source

The source of almost all fresh water is precipitation from the atmosphere, in the form of mist, rain and snow. Fresh water falling as mist, rain or snow contains materials dissolved from the atmosphere and material from the sea and land over which the rain bearing clouds have traveled. In industrialized areas rain is typically acidic because of dissolved oxides of sulfur and nitrogen formed from burning of fossil fuels in cars, factories, trains and aircraft and from the atmospheric emissions of industry. In some cases this acid rain results in pollution of lakes and rivers.

In coastal areas fresh water may contain significant concentrations of salts derived from the sea if windy conditions have lifted drops of seawater into the rain-bearing clouds. This can give rise to elevated concentrations of sodium, chloride, magnesium and sulfate as well as many other compounds in smaller concentrations.

In desert areas, or areas with impoverished or dusty soils, rain-bearing winds can pick up sand and dust and this can be deposited elsewhere in precipitation and causing the freshwater flow to be measurably contaminated both by insoluble solids but also by the soluble components of those soils. Significant quantities of iron may be transported in this way including the well-documented transfer of iron-rich rainfall falling in Brazil derived from sand-storms in the Sahara in north Africa.

Read more about this topic:  Fresh Water

Other articles related to "source":

Homesteading The Noosphere
... Raymond about the social workings of open-source software development ... roots of the gift culture in open source as contrasted with the exchange culture of closed source software ... also investigates the nature of the spread of open source into the untamed frontier of ideas he terms the noosphere, postulating that projects that range too far ahead of their time fail because they are too far ...
Arago Spot - Experimental Aspects - Intensity and Size
... For an ideal point source the intensity of the Arago spot equals that of the undisturbed wave front ... Only the width of the Arago spot intensity peak depends on the distances between source, circular object and screen, as well as the source's wavelength and the diameter of the circular object ... This means that one can compensate for a reduction in the source's wavelength by increasing the distance l between circular object and screen or reducing the circular object's diameter ...
Unsealed Source Radiotherapy
... Unsealed source radiotherapy relates to the use of soluble forms of radioactive substances which are administered to the body by injection or ingestion ... Sealed-source therapy, in which the radioisotope remains in a capsule or metal wire during therapy and is never allowed to dissolve in fluids, is usually ...
Arago Spot - Experimental Aspects - Deviation From Circularity
... still has a sharp edge on a smaller scale) the shape of the point-source Arago spot changes ... Note that this is only the case if the source is close to an ideal point source ... From an extended source the Arago spot is only affected marginally, since one can interpret the Arago spot as a point-spread function ...
Philo Farnsworth - Inventions - Fusor
... at the time were high that it could be quickly developed into a practical power source ... experiments, development into a power source has proven difficult ... Nevertheless, the fusor has since become a practical neutron source and is produced commercially for this role ...

Famous quotes containing the word source:

    You have never by a word or a deed given me one moment’s uneasiness; on the contrary I have felt perpetual gratitude to heaven for having given me, in you, a source of so much pure and unmixed happiness.
    Thomas Jefferson (1743–1826)

    As a means of contrast with the sublime, the grotesque is, in our view, the richest source that nature can offer.
    Victor Hugo (1802–1885)

    Might not the beatific vision become a source of boredom, in the long run?
    Samuel Beckett (1906–1989)