Water - online puzzles


Water is an inorganic compound with the chemical formula H2O. It is a transparent, tasteless, odorless, and nearly colorless chemical substance, and it is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite not providing food energy, or organic micronutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. "Water" is also the name of the liquid state of H2O at standard temperature and pressure.

Because Earth's environment is relatively close to water's triple point, water exists on Earth as a solid, liquid, and gas. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor.

Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume (about 96.5%). Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea.

Water plays an important role in the world economy. Approximately 70% of the freshwater used by humans goes to agriculture. Fishing in salt and fresh water bodies has been, and continues to be, a major source of food for many parts of the world, providing 6.5% of global protein. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating in industry and homes. Water is an excellent solvent for a wide variety of substances, both mineral and organic; as such, it is widely used in industrial processes and in cooking and washing. Water, ice, and snow are also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, diving, ice skating, and skiing.

Tower Bridge puzzle online from photoLake Brienz (Switzerland) online puzzleReine (Norway) puzzle online from photoBuildings on the scarp in Riomaggiore (Italy) puzzle online from photoPont au Change in Paris (France) puzzle online from photoPoint Vincente lighthouse in California (USA) online puzzleAnderson Bridge in Singapore online puzzleMute Swan online puzzleTaj Mahal puzzle online from photoLighthouse in Gaspé (Canada) puzzle online from photoVillage of Castle Combe (United Kingdom) online puzzleHvar Island (Croatia) puzzle online from photoWaterlily nymphaea puzzle online from photoAustin (USA) online puzzleMount Hood in Oregon (USA) puzzle online from photoSunset at the sea coast puzzle online from photoPanorama of Orlando (USA) puzzle online from photoBeautiful beach (Seychelles) online puzzleSt Angel Bridge and Castle in Rome (Italy) online puzzleCoconut Palm online puzzleBig Sur in California (USA) online puzzleFloating market in Bangkok (Thailand) online puzzleSouter Lighthouse (United Kingdom) online puzzleRiomaggiore (Italy) puzzle online from photo
Fresh green smoothie online puzzleBeach in Carvoeiro (Portugal) online puzzleKapellbrücke (Switzerland) online puzzleThe front door puzzle online from photoThe Ganges river in Varanasi (India) puzzle online from photoStevie Ray Vaughan Statue in Austin (USA) puzzle online from photoSand tiger shark online puzzlePennybacker Bridge in Austin (USA) puzzle online from photoVasco da Gama Bridge (Portugal) online puzzleTower of the Pena Palace in Sintra (Portugal) puzzle online from photoLighthouses at Elsinore harbor (Denmark) online puzzleSafari lodge in Tsavo National Park (Kenya) puzzle online from photoTrakai Island Castle (Lithuania) online puzzlePanorama of Salzburg Centre (Austria) puzzle online from photoChurch in Sitges (Spain) puzzle online from photoView of Bruges (Belgium) online puzzleLighthouse on Kauai Island (USA) puzzle online from photoThe old lighthouse in Malmö (Sweden) puzzle online from photoLake Walen (Switzerland) puzzle online from photoMosque on the Island of Malacca (Malaysia) online puzzleMiramare Castle in Trieste (Italy) online puzzleWaterworks fountain at Wismar market (Germany) puzzle online from photoChurch of San Giorgio Maggiore (Italy) online puzzlePohuku Geyser (New Zealand) online puzzle