Answer:
Soil salinity is the salt content in the soil. Salination can be caused by natural processes such as mineral weathering or by the gradual withdrawal of an ocean.
Explanation:
The answer that fits the blank would be the term PRESSURE GRADIENT. The pressure gradient measures which direction and the changes of the rate of the pressure, therefore causing the air to flow from places of relatively increased pressure to places of relatively low air pressure.
The pan-African movement called for unity in Africa
The answer is B