A) Mississippi waterway
B) USA - Canada railway network
C) Great Lakes waterway
D) (d) Panama canal
Correct Answer: C
Solution :[c] It is an important steel city of the United States of America. The steel industry at Pittsburgh enjoys locational advantages. Some of the raw material such as coal is available locally, while the iron ore comes from the iron mines at Minnesota, about 1500 km from Pittsburgh. Between these mines, Pittsburgh is one of the world's best routes for shipping ore cheaply. The famous Great Lakes waterway, trains carry the ore from the Great Lakes to the Pittsburgh area. The Ohio, the Monongahela and Allegheny rivers provide adequate water supply.
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