[yecatsk3]

I just need a little help on which way to read this. I am in a intro to aqueous geochemistry but the teacher seems to think we have all seen this before. It is a graduate course but I haven't taken chem for 5 years. I just need to understand how I can look at this and know if a phase is dissolving or precipitating or how to know if Na+, H+ and H4SiO4 are increasing decreasing or constant. I pretty sure as G goes to K toward the upper right hand corner Na+ H+ and H4SiO4 are all increasing.
as for the Silica saturation line. Does that mean no silica goes to the left of that line? same with the quartz saturation line... What in the heck does that mean?? UGh