Fact 1: Hydrogen bonds cause water to expand when it freezes.

Fact 2: Water freezes into ice when cooled.

Given the two facts above, answer the question "What causes water to expand as it becomes ice?" with the following options: 
- evaporation
 - wind
 - Weathering
 - heat
 - gasoline
 - Generating heat
 - friction
 - hydrogen bonds


 

        hydrogen bonds 