What do u prefer google or bing i'm curious

Why is the indus river so important to the people of pakistan?

How does central place theory explain patterns in the size and distribution of cities?

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?