How to figure out which phase on a phase diagram will be the most dense? If I am given a phase diagram, how can I determine which phase will have more density?

What should I consider to solve these kinds of questions?

Does the answer have to do with the area that each phase occupies?  Or the more area a phase occupies, the more the density?
The solid phase is more dense than the liquid phase. The line that separates solid and liquids bends right.

If the solid phase is less dense than the liquid phase, the line that separates solid and liquids bends left.