Fact 1: When water freezes , that water expands.

Fact 2: Water freezes at zero degrees Celsius.

Given the two facts above, answer the question "What happens when water reaches zero degrees Celsius? " with the following options: 
- vaporization
 - it shrinks
 - colder weather
 - It expands
 - it boils
 - flooding
 - nothing
 - erosion


 

    It expands     