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the properties of water, a unique substance

... grounds of much marine life, which makes their preservation very important. Water’s unique temperature-density relationship results in the formation of distinct layers within non flowing bodies of water, as shown in Figure ...
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Water quality



Water quality refers to the chemical, physical, biological, and radiological characteristics of water. It is a measure of the condition of water relative to the requirements of one or more biotic species and or to any human need or purpose. It is most frequently used by reference to a set of standards against which compliance can be assessed. The most common standards used to assess water quality relate to health of ecosystems, safety of human contact and drinking water.
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