Water+on+Earth

//** Table of contents : **//
 * Earth's Water** ** o f contents **
 * //**- INTRODUCTION**//
 * //**- THE WATER CYCLE**//
 * //**- DID YOU KNOW?**//
 * //**- THE FLOOD**//
 * //**- WATER POLLUTION**//
 * //**- DROUGHT**//
 * //**- CONCLUSION**//
 * //**-**// **//BIBLIOGRAPHY//**

//**- Introduction :**// ====**Water is a chemical substance with the chemical formula H2O,its molecule one Oxygen and two Hydrogen,connected by covalent bonds. Water is liquid at combined conditions,but it often co-exists (Ice),and gaseous state (Water vapor or steam). water also exists in a liquid crystal state near Hydrophilic surface.**====

//** - The Water Cycle **//



====** The water cycle, also known as the hydrologic cycle or H2O cycle, describes the continuous movement of water on, above and below the surface of the [|Earth] . Water can change states among [|liquid] , [|vapor] , and [|ice]  at various places in the water cycle. Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go, in and out of the [|atmosphere] . The water moves from one reservoir to another, such as from river to [|ocean] , or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, runoff, and subsurface flow. In so doing, the water goes through different phases: liquid, solid, and gas. **====

// **- Did You Know? ** // media type="youtube" key="zpvm5VjMacU?version=3" height="349" width="425" align="center"

====**Did you know** ? **We are all water creatures. it makes up 60 % of our body, 70% of our brain and 80% of our blood. while you can go a month without food,but you can't survive a week without water. The water that existed on earth billions of years ago still exist today. It covers most of planet,but just 3% is fresh water and most of that is ice.1% of fresh water is readly to use and less than 0.007% of water on earth is available to drink.**====



//**- The Flood :**// media type="youtube" key="PLs2EmdTMY8?version=3" height="279" width="448" align="center"

====**A Flood is an overflow of an expanse of water that submerges land. Also its defines as a temporary covering by water of land not normally covered by water. In the sense of flowing water. Flooding may result from the volume of water within a body of water, such as river or lake,which overflows or breaks the levees.**====


 * Examples of some floods around the world this year:**

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**Water Pollution is an contamination of water bodies such as lakes,rivers, oceans,and groundwater. water pollution occurs when pollutant are discharge directly or indirectly into water without adequate treatment to remove harmful compounds. Water pollution affects plants and organisms living in these bodies of water,and in almost all cases the effect damaging not only individual species and populations,but also to the natural biological communities.**

**Oil spill in The Gulf of Mexico was one of the most harmful disaster this year. Cleaning can take years and the effect can stay decades.**



 * Water pollution has many forms,all of which are damaging and none of which less important the the other. Oil spill can be deadly and catastrophic.**

//**- The Drought :**//

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====**A Drought is an extended period of months or years when a region notes deficiency in it's water supply. This acuurs when a region receives consistently below the avarage presipitation. It can have a substantial impact on the ecosystem and agriculture of the effected region. although Drought can persist for several years and can cause significant damage and harm the local ecomomy.**====

**- Conclusion :**


 * For the above reasons,water is very important in our life. Climate is changing and that effects our resources from water. While new technologies make our life more developed,they caused a lot of harmful problems to the nature. The water is lacking and world population is going up fast. we have to protect out environment;water is important in life. Clean water can prevent people many diseases.**

//**-**// **//BIBLIOGRAPHY ://** [] [] [] []