Evaporation happens when water molecules move fast enough to break away from a solution and move into the air. When a solution evaporates, the water goes into the air but the solid is left behind.

Water is a unique compound that is essential ... by this property Expansion upon freezing Ordering molecules in crystalline solid results in more void space than in the liquid phase Ice floats ...

Even though ice is at 0 °C, the molecules still vibrate. After freezing, the water molecules are further apart than they were as liquid water. As solid ice, the molecules are further apart, arranged ...