Q27

[rpcuhk]

I can't see why answer choice D is correct.
"sourthward", "northward" I'm so disorientated.
Please help!

[ManhattanPrepLSAT1]

Good news! The answer is (E). So the question now is, "why?"

The second paragraph outlines a process that pushes out the monsoon rains from sub-Saharan West Africa. The reverse of that process will lead us to the correct answer. A growing temperature differential between the middle and high latitudes and the warm tropical latitudes causes the southward expansion of the circumpolar vortex, displacing the winds that bring the monsoon rains. So if the rains have returned, the circumpolar vortex has receded, implying that the temperature differential was reduced.

Answer choice (E) points to the middle step that the circumpolar vortex has resumed it's normal patterns.

Incorrect Answers

(A) contradicts the passage by suggesting that the more northern latitudes are colder and thus would imply a larger temperature differential.
(B) contradicts the passage by implying a larger temperature differential.
(C) contradicts the passage by implying a larger temperature differential.
(D) contradicts the passage because these other large-scale components move southward when the circumpolar vortex expands and then pushes out the monsoon rains.

[tzyc]

So...
We don't have to understand the details here to answer the question? (temp. causes...vortex something...)
I think it's talking about the 2nd paragraph, but I couldn't picture what's going on there
Could you explain in simple words about how it droughts please just in case??

Thank you