The flow of air in a loop caused by differences in temprature and pressure is called <span>Convection</span>
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It's A) the US must be a leader in innovation in order to help steer its course.
After a little research I found that your question is multiple choice.
The answer choices are as follows:
<span>a.his inability to manage relations with the West.
b.his inability to get Russia out of Afghanistan.
c.the overall poor economy.
d.his movement toward communism.
The correct answer is C the overall poor community</span>