Which risk increased when early Copper Age civilizations repeatedly smelted copper ore in the Eneolithic period?

💡 Explanation

When early civilizations smelted copper, arsenic, present as an impurity in some ores, vaporized during heating, causing arsenic exposure as it became airborne and deposited on surfaces. Therefore, arsenic exposure increased significantly, rather than variable bronze strength as bronze wasn't widely used yet, or water contamination/ore depletion, which are different, less-immediate impacts.

• Which risk increases when poorly compacted soil is used in ancient terraced irrigation systems?
• Which consequence resulted when Mesopotamian irrigation canal siltation decreased channel cross-sectional area?
• Ziggurat settlement stability depends on which factor more than compressive material property?
• Which risk increased when ancient Mesopotamian irrigation systems delivered water with high dissolved salt content?
• Which mechanism allowed Roman concrete fortifications to maintain structural integrity in marine environments despite constant wave action?
• Which risk increases when copper sheathing used on wooden ships experiences prolonged immersion in seawater containing dissolved sulfides?