| A | B |
|---|
| fuel | something that is burned to make heat or provide power |
| pollution | dirt that spoils land, water or air |
| Ohio River | where Allegheny & Monongahela Rivers join |
| to help people remember the past | Why was Pittsburgh's Station Square repaired? |
| trade center | river travel helped make Pittsburgh an important ... |
| coal | miners found this important natural resource around Pittsburgh |
| work in factories | Many immigrants came to Pittsburgh to ... |
| dirty air | Major problem faced by Pittsburgh in l940's |
| steel | had material made from iron |
| west | In the l800's Pittsburgh was an important starting point for people moving ... |
| cooperating | People made important changes by ... |
| gas | a kind of fuel |
| large apartment buildings | A new part of life in Bejing, China are ... |
| fixing buildings | Pittsburgh's leaders have made their city more livable by ... |
| heating homes | Some people use coal for ... |
| build libraries | Andrew Carnegie used his money to ... |
| river transportation and natural resources | the main reason Pittsburgh grew |
| mix of new & old buildings | How are Bejing and Pittsburgh alike? |
| buying special equipment to keep air clean | how did factory owners help change the city of Pittsburgh? |
