Non-governmental organizations work in which of the following areas

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?

What are some of the impacts of humans on the earth?

When you start from a given set of rules and conditions and determine what must be true you are using blank reasoning