Q. In what direction do the trade winds blow?
A. That in the northern hemisphere blows from the north-east: that in the southern hemisphere from the south-east.
Q. Why do they not blow from the full north and south?
A. Because the polar current, combining with the equatorial current, give the wind a new direction.
Q. What is the cause of the equatorial current?
A. The rotation of the earth upon its axis.
Q. What is the cause of the polar current?
A. As the heat in the torrid zone is always greatest, and at the poles the least, therefore a constant current of air rushes from the poles towards the equator.
Q. How does the combination of these two currents give a new direction to them both?