Water: The Elixir of life
Water is the most important and most abundant liquid on Earth.
Almost three-quarters of the Earth’s surface is covered with water in the oceans, seas, lakes and rivers and, as ice and snow, in the ice sheets at the North and South poles.
There are also huge quantities of water in the air in the form of clouds or the invisible gas water vapour.
Clean, fresh drinking water is essential to human and other life. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world
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