Water basics

Water is a magical substance. It is both simple and complex. A water molecule itself is simple, made up of 3 atoms -- two hydrogen and one oxygen, H20. The makeup of these building blocks produces a molecule with almost magical properties, which provides the basis for its wide variety of uses.

Find out about the science of water -- its physical and chemical properties -- the hydrologic cycle and how water and climate are related, in this section.

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