298 AIR. 



Q. What are the winds, which blow over the 

 ATLANTIC and PACIFIC Ocean, called ? 



A. They are called "Trade Winds." 



Q. Why are they called TKADE WINDS ? 



A. Because (as they blow uniformly 

 in one direction) they are very convenient 

 to those who carry on trade by means of 

 these oceans. 



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, com- 

 bining with the equatorial current, give 

 the wind & 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. 



