Which risk increased during the Bronze Age collapse due to impurities in smelted copper ore?

💡 Explanation

When Bronze Age copper smelting processes were less refined, inclusion of arsenic or other impurities caused embrittlement because these elements segregated at grain boundaries, weakening the alloy. Therefore, brittleness increased, rather than corrosion, flow reduction or melting point increase, which relate to compositional but mechanically reverse effects.

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