Water is the most ubiquitous material in nature and is the most vital and fascinating of all God's creation. It is the most important raw material for mankind and is called "Liquid Gold". It is mainly because of this magical substance only that earth's temperature is maintained reasonably uniform at an average of 16 °C. Without water its temperature would have varied as on moon where it is 100°C during days and-130°C during nights. Man can
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