Answer: Water expands and becomes less dense when it freezes.
Step-by-step explanation:
When a solid is less dense than liquid that it is put in, it will float.
This is the case with icebergs. When water freezes, the molecules move away thereby expanding and increasing the volume of the water.
The larger the volume of an object, the smaller it's density.
The iceberg will therefore have a lower density that enables it to float.
