How is the method of prediction similar among volcanoes, earthquakes, flooding, and tsunamis

Scientist believe that earths core is around 6000°c where does this heat come from

What is the bill of rights listed in, order

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?