EVAPORATION RAIN. 3 1 



What causes the variety of colours in clouds ? 



What is the general height of clouds above the earth ? 



To what height do they often rise ? 



LESSON VII. 



EVAPORATION RAIN SNOW HAIL RAINBOW. 



THERE is a process, according to the wise de- 

 crees of the Creator, constantly going on, by which 

 a portion of all liquids is converted into steam, or 

 vapour. This process is called evaporation. It is 

 much greater in warm than in cold climates. 



Now God has provided that the whole of the 

 water that is raised by evaporation shall not subsist 

 in the atmosphere at one time in the state of va- 

 pour. A portion of it is continually returning to the 

 earth, and not a day passes without rain falling in 

 some part of the world. The secondary cause of 



