COASTAL PLAIN INDUSTRIES 



397 



there is not the fall necessary for large factories, except 

 sometimes in the hilly region back near the old land where 

 the rivers have developed rather deep and narrow valleys, 

 and mill ponds of considerable size may be made. 



As the different kinds of soil lie in belts, agriculture 

 will vary with the belts. In warm climates rice can be 

 raised along the shore 

 where the land is 

 marshy. On the sandy 

 land most profitable 

 truck farming is possi- 

 ble if the transportation 

 facilities are good. In 

 many places in the 

 southern states these 

 sandy areas support fine 

 forests of pine (page 

 198) which are most val- 

 uable for the production 

 of turpentine, tar and 

 lumber. Where the soil 

 is not too sandy, cotton 

 is raised in abundance. 

 The materials for mak- 

 ing glass, pottery and 

 brick are widespread 

 over coastal plains. 



The cities on coastal plains are usually found either 

 (1) near the coast, where the rivers have formed harbors 

 and so have made ocean commerce possible, or (2) at 

 the head of navigation in the rivers where water transporta- 

 tion begins, or (3) still farther up the river at the fall line, 

 where manufacturing on a large scale is possible. 



The fall line is the point on a river where its bed passes 



COTTON. 



A most valuable product of the southern 

 coastal plain. 



