Assertion: fire | /r/CapableOf | obtain iron
Facets:
Source sentences:
text: From the use of fire to cook food, to clear land, and to furnish warmth and illumination in caves or hovels, fire has been applied to vessels of clay to make pottery and to pieces of ore to obtain copper and tin, to combine these to make bronze (c. 3000 bce), and to obtain iron (c. 1000 bce).