Advanced Geography . 138 COAL. —IRON. Pennsylvania, at the northern end of the Appalachiancoal field, supplies more than one half the coal used in theUnited States. Illinois ranks second, and Ohio third. Pennsylvania furnishes nearly all the anthracite coal mined inthe country, aswell as a largepart of the soft,or bituminous,coal. The hardcoal is found nearthe northern endof the Alleghenyridges. The coalof the Illinoisfield aided great-ly in the settle-ment of theprairies wherewood was scarce. Large quan-tities of softcoal are put into ovens that shut out most of the air. These areheated till
Advanced Geography . 138 COAL. —IRON. Pennsylvania, at the northern end of the Appalachiancoal field, supplies more than one half the coal used in theUnited States. Illinois ranks second, and Ohio third. Pennsylvania furnishes nearly all the anthracite coal mined inthe country, aswell as a largepart of the soft,or bituminous,coal. The hardcoal is found nearthe northern endof the Alleghenyridges. The coalof the Illinoisfield aided great-ly in the settle-ment of theprairies wherewood was scarce. Large quan-tities of softcoal are put into ovens that shut out most of the air. These areheated till certain gases are driven off or burned. Bythis process the coal is changed to coke, which is betterthan soft coal for heating purposes. Charcoal is made by burning or charring wood to whichvery little air has access. Charcoal resembles true coal, A
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