People cannot live without water and couple of days. And meanwhile a lot of time mankind not only did not know that it represents, but also did not guess how many it on the planet Earth. Also it was not clear at all from where there was this substance. What is called water?
Instruction
1. All reasons to believe are had that life occurred in the water environment. Several billions years ago our planet was formed of the cloud consisting of gas and dust, and over time condensed and condensed. And on it there was already this substance. Perhaps, it represented ice dust. It is confirmed by some researches. It is established that the main components of water are hydrogen, oxygen. They belong to the most widespread elements of space.
2. Water is the real creator of all live, one of the main "construction materials". This colourless liquid is divided into three views: fresh, salty, brines. This only substance which can be in the nature in 3 aggregate states – firm, liquid and gaseous. It has features which are of great importance for such processes as, for example, formation of climate of the planet and a relief.
3. Water is mobile and participates in circulation of substances, traveling on huge distances. It can evaporate from the surface of oceans, seas, rivers and reservoirs. About 1/3 energy which the planet receives from the Sun are used on water evaporation.
4. At the same time formed steam gathers in an upper atmosphere in a cloud. It is transferred by winds, and then in the form of snow or a rain drops out on the Earth's surface. This precipitation filters into the soil and forms underground and ground waters. They come to a surface and fall into streamlets and the rivers which bring them to oceans and the seas again.
5. It plays very important role in activity of a human body, a plant and animal life. The viability of living cells is caused by water presence. If to consider its value for the person, then it is possible to note that our organism consists of water solutions, suspensions, colloids. This substance delivers in cages nutrients - mineral salts, vitamins. Besides, it carries away various slags and waste of activity. The person needs about 1.5 l of water a day.
6. Water all the same remains low-investigated in the nature. Chemical compound – H2O - seemingly simple element, but does not have substance more mysterious and mysterious, than plain colourless liquid.