Where do most of mexico's people live today

Explain: plate tectonics and people.

Which was not a country that massively built up its navy in the early 1900s? germany china united statesbritain

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?