Q: Fact 1: Hydrogen bonds cause water to expand when it freezes. Fact 2: Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin. Given the two facts above, what causes water to expand?

Pick your answer from:
[1]. evaporation.
[2]. Condensation.
[3]. Generating heat.
[4]. electrostatic.
[5]. friction.
[6]. heat energy.
[7]. heat produced.
[8]. wind and erosion.
The answer is:
[4].