What causes solid water to be less dense than liquid water?

Because the way the hydrogen bonds causes molecules to push farther apart, which lowers the density.

Choose the one BEST answer to provide evidence for the statement.  

The Port of Savannah is economically important to Georgia. : A. The global demand for goods and services have increased.

I'm sorry but the only one I know for sure is the last one which I just answered up there but here are my guesses for the other ones.

How did the Georgia legislature respond to the U.S. Supreme Court’s decision in Brown vs. Board of Education? : C

Again I'm only really sure about the last one but I tried to answer the first one to the best of my ability.