Why is northern africa much warmer than southern africa

Explanation:

The sun's rays are closest to the equator. There are much stronger there than (say) at the poles.

The further you move from the equation going south (in this case). the less strong the sun's rays are. So the northern part of Africa is very close if not right on the equator, while the southern part of the continent is much farther than the northern part.

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a drastic rise in oil prices ended decades of postwar.