The hydrosphere represents one component of earth's system, operating in conjunction with the solid crust (lithosphere) and the air that envelopes the planet (atmosphere). On earth, water exists in the three primary of matter: liquid, solid and gas. Hydro means water and so hydrosphere is consists of all the earth's water including rivers,streams,lakes and oceans. Almost the earth's elements is consists of water. According to the research, hydrosphere basically a combined mass of water that is found on earth, that makes up around 71% of the earth surface which is covered with water. No other planets that has consists of much liquid water on it's surface compared to planet earth. Earth is the only planet who composes water. 
Water is very important in our daily living. It is essential to life, without water, humans would not able to live in this world. There's a lot of processes or ways of water cycle. Boiling of water is an example of evaporation, from liquid it turned into gas. Another process is condensation and the best example for this is the water from clouds will fall down tom the earth's surface.
Humans use water in a number of ways. Drinking water is obviously very important and also water is used in industry purposes. Water can also be used to generate electricity through hydro-power plantations. We NEED water then CONSERVE water!
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