RAIN 21 



farmer, who has not properly protected his fields, crops, 

 and roads. 



18. Evaporation as a Temperature Regulator. — An- 

 other great work done by rain is to help to keep the 

 earth from Incoming too warm. The heat waves from 

 n evaporate from the earth's surface great quan- 

 of water to form clouds. The moisture which 

 forms these clouds has been warmed by the heat waves, 

 ami. when it rises, carries with it much heat from the 

 earth. Kising above the earth, the clouds come in con- 

 tact with the colder upper air; here their heat is given 

 up, or radiated, and they fall back as rain. The heat 

 which they radiate passes through the thin upper air 

 and i> LotJ in outer space. 



/ \/7 7.7 1//. \ ra 



/. 'hil.. .: glass tumblrr wail;/ full of vatrr a,td in it stir up 

 "lui.ni/ s.,il. \\ fQON M //'"< •*/"/' stirring notirr h<m Ho- 

 st, il parti, I. s I,,, n„ /.. 'Inch /«// 



4Um first. \oticr also that sonic Jin* parti, I. | continue to 

 flout in tin- ir.,1, r J,,,- hours or even days. ring parti- 



<i' l< i <i long time from 8till uat> r. \<l>l a lit- 

 tl, alii,,, solution to this clomlg mit>r mid *< | uhat trill happen. 

 !. I tpormtt rl.iir spring uatcr in a cl*an dish, and notice 

 th. .1. posit Irft in th, dish. I his depoait is made up of the salts 

 trhich thr spring tains and trhich it has dissolved from 



the soil. Rain water if evaporated in a clean dish leaves almost 

 no deposit. 



Questions 



1 How are rain clouds formed? 2. With what does the rain 

 supply uh? 3. How do rains affect exposed lards? 4. How is 

 ■ tfnlly formed? 5. Where does the soil go which is washed 

 host aflkftdti hv the rains? 6. Why is the soil of creek and 



