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how does the sahara desert act like a barrier between north africa and sub-saharan africa? include cultural and physical impacts in your answer.

Serves as a kind of border between North Africa and Sub Saharan Africa, both culturally as well as in terms of climate - moving from desert to tropical. The climate here can be rugged and unpredictable, and spark social crises and conflicts.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.

(4,-2)

explanation:

6x+4y=16

-6x-9y=-6

-5y=10

y=-2

x=4