<span>The coriolis effect does this. This is a inertial force that acts on objects that are in motion relative to a rotating reference frame. This means that when the earth rotates, objects in the north hemisphere is deflected to the right, while objects in the southern hemisphere are deflected to the left. This makes the winds shift left or right.</span>
There is a U-shaped region called The Fertile Crescent.
Hope this helps!
Variations in air pressure from place to place are the principal cause of wind.
