Which mineral is the least reliable for identifying a mineral?

How many countries have portuguese as a national language?

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?

Where is a good place to get laid inside walmart with a boy