News tagged with water

Related topics: drinking water , climate change , water molecules , liquid water , ocean

How plankton gets jet lagged

A hormone that governs sleep and jet lag in humans may also drive the mass migration of plankton in the ocean, scientists at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, have found. ...

Sep 26, 2014
popularity not rated yet | comments 0

Coke, Pepsi pledge to reduce calorie consumption

Coke, Pepsi and Dr Pepper said Tuesday that they'll work to reduce the calories Americans get from beverages by 20 percent over the next decade by more aggressively marketing smaller sizes, bottled water ...

Sep 23, 2014
popularity not rated yet | comments 0

Dirty water raising health risk in flooded Kashmir

The floodwaters are finally receding in much of Kashmir, but health experts worry a crisis could be looming with countless bloated livestock floating across the waterlogged region and hundreds of thousands ...

Sep 16, 2014
popularity not rated yet | comments 0

Drink up for exercise, but not too much

With students heading back to school, fall sports are in full swing. In addition to training, eating right, and getting enough sleep, a significant key to health and performance is staying hydrated. However, the recent tragic ...

Aug 27, 2014
popularity 5 / 5 (1) | comments 0

Water

Water is a ubiquitous chemical substance, composed of hydrogen and oxygen, that is essential for the survival of many known forms of life. In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapor or steam. Water covers 71% of the Earth's surface. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Saltwater oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products. Other water is trapped in ice caps, glaciers, aquifers, or in lakes, sometimes providing fresh water for life on land.

Water moves continually through a cycle of evaporation or transpiration (evapotranspiration), precipitation, and runoff, usually reaching the sea. Winds carry water vapor over land at the same rate as runoff into the sea. Over land, evaporation and transpiration contribute to the precipitation over land.

Clean, fresh drinking water is essential to human and other lifeforms. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world. There is a clear correlation between access to safe water and GDP per capita. However, some observers have estimated that by 2025 more than half of the world population will be facing water-based vulnerability. Water plays an important role in the world economy, as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70 percent of freshwater is consumed by agriculture.

This text uses material from Wikipedia licensed under CC BY-SA