why the water bodies of the earth are useful to us in many ways
Answers
Water bodies of earth are useful to us as they are natural resource and help in our survival.
Water is a dynamic medium, continually changing from liquid, to solid, to gas. As it cycles from its gaseous phase in the atmosphere, to its liquid and solid forms on the earth, it provides life for an entire planet. The total amount of water on the earth and in the atmosphere has been calculated to be between 1.3 and 1.4 billion km3. That total volume never changes - it merely recycles. Three quarters of the surface of the earth is covered by oceans, comprising 97.2% of the total water volume on earth. 2.15% is in the form of ice and .001% is included in the atmosphere which surrounds the earth. Of all the water that continually cycles and recycles on the earth’s surface, only a small percentage is actually available for our use. Usable water includes underground aquifers and above-ground rivers, lakes, streams, and marshes, comprising only .65% of the total water on the planet. The precious water that is here must continually cleanse and renew itself. It accomplishes this miraculous feat through what is known to science as the Hydrologic Cycle in an exquisite interplay between the two physical actions of evaporation (gaseous) and condensation (liquid), as can be seen depicted in the diagram above. It evaporates from the oceans and moves through the atmosphere traveling on wind currents. As the cycle continues, vapor in the atmosphere ultimately changes form and falls to the earth as rain or snow - ending up in rivers and oceans to begin the cycle all over again.
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