B - when the warm, moist air and the cool, dry air meet, they create instability in the atmosphere
I don really know why but it never made sense to me
I believe that aa rift valley is happening because the two tectonic plates are combining while another plate is going downwards to create a valley. Hope this helps and have a fabulous day!
Answer:
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C since in 2011, the South Sudanese voted on a referendum in which about 99% of the voters voted to separate from Sudan and to become an independent country.