Which events increased the water content in earth’s atmosphere?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1