What kind of air masses originate in canada

Is an official language in every north african country

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?

Would you rather live in a society that offers more economic freedom or economy equity? explain why and defend your answer.