1.under the heading of plate tectonics, there are three types of boundaries. in a convergent boundary, plates collide. true or false? 2.although water levels drop, the amount of water on earth remains the same-just in different forms. true or false?

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?