Which body of water is not located on the shores of northern europe

As water is cooled from 4 c to 0 c its density

How can studying economics us make better choices about how to use scare resources

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?