What is a growth point(in geography)

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?

Which event most likely explains renewed demand in a recovery period? consumers choose to save more and spend less. economic policy renews consumer confidence and demand. producers decrease prices to prompt demand and recovery. production decreases to prompt increased demand.

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