Water has unique properties that allow it to perform important functions. It is made of molecules consisting of one oxygen atom and two hydrogen atoms. Its density is lower than ice, allowing ice to float. Water is a powerful solvent that can dissolve many substances like grease, oil, oxygen, and carbon dioxide. It has a high specific heat capacity meaning it does not get hot or cold easily, helping to moderate Earth's climate. Water's cohesion and adhesion properties result from the attraction of water molecules to each other and other substances. This allows water to form drops, climb tubes through capillary action, and be absorbed by plants, which all rely on these properties to survive.