On december 21 of this year, the sun will be at what declination angle?

Fertility and mortality rates are higher in more developed nations.

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?

The amazon river is in africa true or false