1. WATER AND ITS FONCTION

3. Comprising over 70% of the Earth’s surface, water is undoubtedly the most precious natural resource that exists on our planet. Without the seemingly invaluable compound comprised of hydrogen and oxygen, life on Earth would be non-existent: it is essential for everything on our planet to grow and prosper. Although we as humans recognize this fact, we disregard it by polluting our rivers, lakes, and oceans. Subsequently, we are slowly but surely harming our planet to the point where organisms are dying at a very alarming rate. In addition to innocent organisms dying off, our drinking water has become greatly affected as is our ability to use water for recreational purposes. In order to combat water pollution, we must understand the problems and become part of the solution. Water Pollution : Ecology.

4. The pollution of Water in LEDC’S .

5. The pollution of Water in MEDC’S.

6. Water is inequaly distributed around the world. Geography

9. • Water is contained even in the solid crystalline rocks. So into 1 [m]3 of granite are located approximately 26 liters of water. Physic • The most transparent water in the Sargasso Sea, where it is possible to see up to the distance to 66 m. • Reverse process - passage from liquid state to gaseous, is called evaporation . Surface evaporation of water and even ice ( sublimation ) also depends on the humidity of air, which makes it possible to dry linen in freezing weather. By this is explained the fact that the heat in the coastal areas with the moist climate is transferred with more difficulty than in the continental.

11. Water in chimistry Water is an unusual compound with unique physical properties . As a result, its the compound of life . Yet, its the most abundant compound in the biosphere of Earth. These properties are related to its electronic structure, bonding, and chemistry . Water consists of only hydrogen and oxygen. Both elements have natural stable and radioactive isotopes . Water composition :

12. Astronomy • American astronomers in the constellation of Pegasus discovered the tracks of water vapor in the atmosphere of planet HD 209458b. Planet relates to the class “hot Jupiter” and are located from us at a distance 150 light years. • On Venus at the height of 50 km the temperature falls to 70 degrees, pressure approaches pressure on the earth's surface, and in the clouds of planet the large number of water is contained. • The composition of the rings of planet Saturn is heterogeneous. Internal rings are folded of the particles with the predominance of silicates, and external consist of chunks and small splinters of water ice with the admixtures of ammonia.

18. The End Authors: Mathilde Nault Marie Clement Amirana Chichua Juliette Nault