Which primary risk increased for Roman arch bridges as the concrete mix evolved during bridge construction?

💡 Explanation

Lateral thrust increased on abutments because the improved *pozzolanic reaction* led to stronger concrete, therefore structures could be taller and arches wider, rather than being limited.

• Which limitation constrained ancient mariners using an astrolabe?
• Which consequence occurs when misalignment error arises in astrolabe scales?
• Which risk increases when moisture permeates Byzantine mosaic tesserae mortar?
• Which mechanism enables ancient timber-framed buildings to withstand seismic activity?
• Which benefit primarily resulted from terrace farming in the pre-Columbian Andes?
• Which outcome occurs when early cast iron plowshares experience rapid, repeated mechanical stress?