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Water
Water
is a chemical substance that is essential to all
known forms of life. It appears colorless to the
naked eye in small quantities, though it is actually
slightly blue in colour. It covers 71% of Earth's
surface. The United Nations Environment Programme
estimates there are 1.4 billion cubic kilometres
(330 million mi3) of it available on Earth, and
it exists in many forms. It appears mostly in
the oceans (saltwater) and polar ice caps, but
it is also present as clouds, rain water, rivers,
freshwater aquifers, lakes, and sea ice. Water
in these bodies perpetually moves through a cycle
of evaporation, precipitation, and runoff to the
sea. Clean water is essential to human life. In
many parts of the world, it is in short supply.
Significant quantities are believed to exist on
the moons Europa and Enceladus. (Credit:
Wikipedia).
Events
World
Water Day – March 22, 2007
Climate
Movement
Profiles
Nature
Politics
Murray-Darling
Basin Commission
Desalinization
Plant
Environmentalists
and the environment
Islands
Tsunami
Surfing
Coastal
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