Solve the riddle for layers of atmosphere 1.I may be very negligible in our community but without me the Earth would be dry. Who am I?
2.We hardly socialize with other members of our family. Who are we?
3.People compare me with their transparent house. Who am I?​

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?