Fact 1: When water freezes , that water expands.

Fact 2: Water pipes can freeze and burst.

Given the two facts above, answer the question "Pipes can burst because at low temperatures, water does what?" with the following options: 
- break off
 - moves
 - expand
 - evaporate
 - squeeze
 - flooding
 - boil
 - shrink


 

   expand      