Geography
Answer
Due to the rotation of the earth on its tilted axis, the wind starts deflecting to its right in the Northern Hemisphere. In the Southern Hemisphere, it starts deflecting to its left from its original path.
Thus, a wind blowing from the north becomes north-easterly in the northern hemisphere and the wind blowing from south becomes south-easterly in the southern hemisphere.
The Coriolis effects is greatest near the poles and zero at the equator because of the earths spherical shape. It is proportional to the angle of the latitude.