Pure Acetic Acid has a freezing point of 260 K or 16.5 degrees. Hence at room temperature it is often in a frozen state. This gives the look of ice like crystals to it, reminding us of glaciers found...
It readily takes up water.
pKa of acetic acid is 4.78
Glacial acetic acid is concentrated acetic acid. It is clear.
CH3COOH