What is the physical quantities of physical map?

Most of earths fresh surface water is found in

Which question did the author of how to grow a school garden consider about the audience before writing the project plan

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?