EFFECT OF MOUNTAINS ON CLIMATE 



429 



If mountains are not too high, they are also regions of 

 forests and furnish great quantities of lumber. The sur- 

 face is so rough that agriculture is not easily carried on, 

 but they have great areas of pasture which often support 

 large herds of cattle, sheep, and goats. 



204. Effect of Mountains on Climate. All over the world 

 where people have the money and the leisure they are 

 accustomed to go either to the mountains or the seashore 



TOP OF PIKE'S PEAK IN SUMMER. 

 Notice the snow and the rocks broken up by the freezing water. 



in summer in order to get where it is cooler. They might 

 for the same purpose travel northward in the northern 

 hemisphere, but they would need to go many times as far 

 to get the same fall of temperature. 



In summer one must ascend a mountain on an average 

 about 300 feet vertically to get a mean fall of 1 F., 

 whereas one must travel over 60 miles north to get the 

 same change. In winter one must ascend farther on the 

 mountain and travel not so far north, to get a change of a 

 degree. As one ascends a mountain it grows colder and 

 colder. In ascending a high mountain in the tropics one 



