No political boundaries are human creations and they often make use of physical features. True False

False

Explanation:A political boundary is indeed a human creation which each country creates to draw a political units which separates them from another state or country. They also make use of geographic features such as using a river as a border. It can even creates rivals amongst different states on where each border ends.

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.

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