Someone please help me out, thanks. :)

Why is the indus river so important to the people of pakistan?

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?

Apex! which term describes the expanse of flat land in this photograph? (see picture) a.) mountainb.) plainc.) rift valleyd.) plateau