WATER: Water is a chemical compound with the chemical formula H2O. A water molecule contains two hydrogen atoms and one oxygen atom connected by polar covalent bonds. Water has a pH of 7 (neutral).
WATERSHED: An area of land in which all of the water drains to the same location. Watersheds are also called river basins or drainage basins.
WATSON, JAMES: One half of the team that helped to determine the helical structure of DNA in 1953.