Isabella read about what can happen at the different kinds of plate boundaries. At a convergent boundary, water may be trapped and may mix with the material in the mantle. What occurs if this material reaches the surface before cooling? A. a major earthquake
B. a volcano
C. a tsunami
D. a folded mountain

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?