Water

 

Water is a colorless, odorless, transparent liquid that is comprised of two hydrogen molecules and one oxygen molecule, H2O.  It freezes at 0 degrees Celsius (32 degrees Fahrenheit) where it becomes a solid, and boils at 100 degrees Celsius (212 degrees Fahrenheit) where it becomes a gas. It is extremely abundant on earth and comprises the oceans, lakes, and rivers though with different additional compositions mixed into it.  Water evaporates from the oceans, lakes, and rivers, condenses in the atmosphere into clouds, and returns to the earth as rain.