Learning about wine

[Dogwalker]

Evening everyone.
Because of the lack of any(that I know of) wine courses in my area I have opted to purchase a book called "The University Wine Course", by Marian Baldy PH.D. It is a wine appreciation text and self tutorial. It is published by the "Wine Appreciation Guild".
It seem to be quite complete and covers just about all areas of wine, its history, the growing and tasting and enjoying of it. I t has self tests at the end of each chapter.
I think that I will enjoy it.
I do although have a couple of questions for the board.
1. Having a glass of that "over oaked" Cab. Sauv. I noticed the "legs" of the wine. Do they decrease as the alcohol in the wine begins to evaporate, or do they remain constant?
2. I know that the aroma of the wine is released as you coat the inside of the glass and the wine mixes with the air. Does the aroma decrease as the wine warms in the glass and the alcohol disapates? Does the aroma change in any way as it sits in the glass?
3. Does the aroma react differently from wine to wine (red verses white)?
The humble "grasshopper" thanks you for your help.
Regards, Chuck