Introduction: Water is a fundamental component of life on earth. In contrast to the mineral, plant and animal kingdoms, it is and will continue to be, a renewable resource. Rain and snow, although irregular over short time periods and at local and regional levels, are recycled though rocks, soil and plants, eventually returning to the ocean to renew the procedure. Whilst the ... hydrological cycle, and the quality and quantity of water, differ immensely according to geographical location, the undisturbed biophysical environment is well adjusted to this cycle. These differences only ... susta...

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