Plz help me out with this question what would be the current measurement of the air pressure?

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?

Aside from english, what other language is widely spoken in canada?

In africa what do they call a crop grown for direct sale and not for use?