What causes two distinct pressure zones between the equator and the poles? A. Earth's rotation
B. The troposphere interacting with the mesophere
C. The ozone layer
D. The fact that nitrogen is heavier than oxygen

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j