Most of the ocean is divided into horizontal depth zones based on density, and known as 2. . photic zone and aphotic zone 4. . shelf, slope, rise, and abyssal 3. . mixed layer, pycnocline, and deep layer 2. . wind-driven layer and thermohaline layer

What is the reason for the “scramble for africa”?

Which of the following statements best explains why there tends to be a greater number of large cities in southern africa than the east africa

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?