The answer is; Wind
They drive atmospheric circulation. The sun does not heat the earth evenly. The parts that are heated up more form the low-pressure systems where air masses move in from high-pressure systems to form winds. These air masses are also deflected by Coriolis effect caused by earth’s rotation.
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The term is upwelling that is the answer to your question.
Answer:
It is difficult to cross.
Explanation:
The Sahara desert is a vast region about the size of the continental United States that is extremely dry and barren. The lack of water resources in the desert make the land unsuitable for agriculture and human population.
As a result, the Sahara acts as a giant natural wall both economically, culturally, and socially since relations between states to the north and south of the desert are difficult.
