Air in the atmosphere continuously moves by convection. At the equator, air rises; at the poles, air sinks. This occurs because

explanation: no but i do not usually comment

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a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.