Which risk increases when a large coastal levee system experiences prolonged saltwater intrusion?

💡 Explanation

When levees experience prolonged saltwater intrusion, soil salinization occurs because the sodium ions displace other cations in the soil matrix, destabilizing the soil structure, weakening resistance to erosion/collapse. Therefore accelerated salinization results, rather than altered seismicity, marsh methane production, or sediment deposition, which involve unrelated processes.

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