Advanced Geography . but the former is much the lighter and the more porous. All the large cities in or near the coal fields are im-portant markets for coal. Among the cities having thelargest trade in this product are Philadelphia, Pittsburgand Chicago. Great Britain, Germany, Austria, France and Belgiumhave extensive coal beds and iron mines, and have there-fore taken a leading place among the manufacturingcountries of the world. 129. Iron. There are four principal iron ore districts in the United States. These are all in old worn-down mountain regions. The most productive district is near t
Advanced Geography . but the former is much the lighter and the more porous. All the large cities in or near the coal fields are im-portant markets for coal. Among the cities having thelargest trade in this product are Philadelphia, Pittsburgand Chicago. Great Britain, Germany, Austria, France and Belgiumhave extensive coal beds and iron mines, and have there-fore taken a leading place among the manufacturingcountries of the world. 129. Iron. There are four principal iron ore districts in the United States. These are all in old worn-down mountain regions. The most productive district is near the shores of lake Superior. Theother districtsare the Alle-gheny ridgesin Pennsylva-nia; the Adi-rondack moun-tains in NewYork; and thesouthern partof the Appala-chian highlandin Alabama. The process ofextracting ironfrom its ore iscalled smelting. The usual mode of smelting is as follows: Theore and coal, with some limestone, are placed in a tall furnace, andthe coal is then set on A hot blast of air is force
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