<http://schema.org/description>
"Without water, Earth would be a barren and lifeless planet. But did you know the Earth&amp;#039;s water supply has not increased or decreased for billions of years? No wonder hydrologists are so fascinated by water."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/environmental/earth/oceanography/hydrology2.htm>