Water is so important since beginning of LIFE that all the major civilization take place near the river in the world. RIVERS plays an important role in developing major cities in India as transportation is much EASIER through river. Nowadays Scientists are talking about the life on Mars as they found some frozen water and moisture in Air. Scientists are still exploring the life on mars, but main point is that due to water availability, we can imagine of life otherwise there is no possibility of life thus we can also say that ‘water is life’.

Water is important for the ecological balance of the earth i.e. Water from Sea evaporates and joins the air as water vapor and turn into cloud. When cloud transfers from sea to plain area, and cool down, it converted into rain and FILL the river and ground water again.

Water covers 71% of the Earth's surface, and is vital for all known forms of life. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products.

Water on Earth moves continually through a CYCLE of evaporation or transpiration .

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