There is the same amount of water on the Earth as there was when the Earth was formed. The water from your faucet could contain molecules that dinosaurs drank!
Water is composed of two elements—hydrogen and oxygen. Two parts hydrogen plus one part oxygen equals H2O.
Nearly 97 percent of the world's water is salty or otherwise undrinkable. Another two percent is locked in ice caps and glaciers. That leaves just one percent for all of humanity's needs—all its agricultural, residential, manufacturing, community, and personal needs. (Note: Of that one percent of water for all humanity's needs, more than 9 out of 10 gallons of it is ground water!)
Water regulates the Earth's temperature. It also regulates the temperature of the human body, carries nutrients and oxygen to cells, cushions joints, protects organs and tissues, and removes wastes.
Seventy-five percent of the human brain is water and 75 percent of a living tree is water.
A person can live about a month without food, but only about a week without water.
Water is part of a deeply interconnected system. What we pour on the ground ends up in our water, and what we spew into the sky ends up in our water.
The average total home water use for each person in the United States is about 50 gallons a day.
The average cost for water supplied to a home in the United States is about $2 for 1,000 gallons, which equals about five gallons for a penny.
Water expands by nine percent when it freezes. Frozen water (ice) is lighter than water, which is why ice floats in water.
(Source: U.S. Environmental Protection Agency)