What would be the BEST title for this group of terms? A)
Countries of Northern Africa
B)
Ethnic Groups Found in Africa
Countries of Sub-Saharan Africa
D)
Origins of African Slaves in the 1500s

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Explanation:

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.