You are presented with the question "What causes water to expand?" and the following answer choices: 
- evaporation
 - Condensation
 - Generating heat
 - electrostatic
 - friction
 - heat energy
 - heat produced
 - wind and erosion

Now knowing that hydrogen bonds cause water to expand when it freezes and hydrogen bonds Hydrogen bonds are primarily electrostatic in origin, choose the best answer.


 

    electrostatic     