REVIEW OF CHAPTER XIII. 



What is a mine ? A pit or other opening dug in the earth from 

 which men gel coal, iron, or any other minerals. 



Mention some of the different parts of a mine and its works. 



Which is the most useful of all the minerals ? Coal. Mention 

 some of its uses. How is coal taken out of a mine ? What are 

 the dangers of coal-mining ? How do miners see to work in the 

 dark mines ? 



Do you know what coal is made of? What is charcoal ? What 

 are made from coal ? 



Where does most of the coal used in the world come from ? 

 Where are the deepest coal mines ? 



Which is the most useful of all metals ? Iron. Is iron taken 

 out of the mine in a pure state ? How is it separated from im- 

 purities ? 



What is pig iron ? What is wrought iron ? Of what kind of 

 iron are stoves made ? Of what kind are iron chains and horse- 

 shoes made? 



What is steel ? What articles are made of steel ? What state 

 is celebrated for its coal and iron ? Pennsylvania. In what direc- 

 tion is Pennsylvania from your state ? 



How is salt obtained from the earth ? What countries contain 

 valuable salt mines? Does all salt come out of the mines? 



What states and territories are celebrated for their silver mines? 

 What two countries in South America have long produced silver? 



What is the most valuable of all metals? Gold. How is gold 

 obtained? Where? What is gold leaf? Are gold watches, 

 chains and rings usually made of pure gold ? Why not ? Where 

 is California ? Nevada? Australia? 



Where are the richest copper mines ? What are made of cop- 

 per? Of brass? Is brass found in the earth as copper, iron, etc., 

 are found? Of what two metals is copper made ? 



Where are the most extensive tin mines? Point to England, 

 Australia? Malay Peninsula. 



What is zinc used for? Where is it obtained? What states 

 contain extensive lead mines? In what direction from your state 

 is Wisconsin? Illinois? Iowa? Missouri? 



