Which geological effect increases risk of Roman road failure caused by 'via ruinae'?

💡 Explanation

When roadbeds are built over regions of karst topography, solution weathering dissolves soluble rocks, causing subsidence because the ground collapses into voids, leading to 'via ruinae' failures. Therefore subsidence increases risk, rather than retreat, liquefaction or sulfate attack, which rely on glacial meltwater, seismic events and significant air pollution, that happen elsewhere in ancient europe.

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