News tagged with water

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

Student creates H2O-Pal to track water intake

Sophia Anger can't believe the number of reusable water bottles she's gone through in her lifetime—at least 70, she estimates. Anger's not wasteful or absent-minded, she simply has to drink double the daily recommended ...

Jun 23, 2015
popularity14 comments 1

Summer beach time means water safety

(HealthDay)—The millions of Americans who will flock to beaches this summer need to keep safety in mind as they frolic in the sand and surf, an expert advises.

Jun 20, 2015
popularity9 comments 0

Tracking the viral parasites cruising our waterways

Humans aren't the only ones who like to cruise along the waterways, so do viruses. For the first time, a map of fecal viruses traveling our global waterways has been created using modeling methods to aid in assessing water ...

Jun 16, 2015
popularity6 comments 0

A slow burning natural disaster

Sometime in the next several days, monsoon rains will begin to sweep across India and gradually move northward, offering drenching relief to thousands caught in this year's relentless heat wave. Andhra Pradesh, one of the ...

Jun 04, 2015
popularity10 comments 0


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

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