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On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river

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?

After world war 2, many people moved from the cities to?