74 



GENERAL SCIENCE 



of the rotation of the earth. Pour a small amount of water at the 

 north end of a revolving globe. The rotation of the globe causes 

 the water to run in a stream in a westerly direction above the 

 equator, and easterly below the equator. 



FIG. 60. The wind systems of the world. 



Sea Breezes and Land Breezes. During the day the earth 

 becomes warmer than the water. The air over the earth rises, while 

 the cooler air from over the ocean rushes in toward the land, causing 

 sea breezes. At night the opposite condition is true, as the land 

 cools off much faster than the water. 



Monsoons. Monsdons are winds which blow from the Indian 

 Ocean to the heated lands toward the Himalaya mountains. (Such 

 winds blow from May to OctoberN During the remaining parE of 

 the year the land is cooler than the water and the wind blows toward 

 the ocean. 



Tornadoes. Tornadoes are immense whirlwinds which are caused 

 by overheated conditions. They are preceded by the formation of 



