Did you know water is most dense at 4°c (39°f)? that is why lakes don't freeze to the bottom. if water was most dense at 32°f then lakes would freeze to the bottom in the winter. considering the density of water changes as its temperature changes, what percentage of sea level rise is from the expansion of sea water as its temperature rises (vs. melting glaciers)? question 14 options: 10% 20% 50% 70%