Which outcome predictably occurred when ancient Mesopotamian bronze tools were repeatedly re-smelted?

💡 Explanation

Increased arsenic embrittlement occurs because repeated smelting caused arsenic concentration increase via gradual reduction of other metallic components; therefore, embrittlement increased, rather than ductility, because arsenic segregates at grain boundaries under thermal cycling.

• Which outcome occurred when the Sumerians over-exploited Tigris-Euphrates irrigation channels?
• Which effect arises by using geared astrolabes to model eccentric orbits of Medieval astronomical models?
• Which consequence arises from inconsistencies in medieval Islamic astronomical data tables?
• Which consequence results when thermal stresses warp a brass sextant's frame during celestial navigation?
• Which risk was magnified when early Mesopotamians surpassed available copper sources around river civilisations?
• Which risk increases when Inca terracing loses structural integrity?