Which risk increases when thermohaline circulation weakens substantially due to polar ice melt?

💡 Explanation

When thermohaline circulation weakens, reduced poleward heat transport occurs because density gradients diminish, preventing the efficient transfer of warm water masses to high latitudes. Therefore regional cooling results, rather than coastal erosion, reduced volcanic activity, or desertification, which depend heavily on other factors like glacial mass balance, and rain patterns.

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• Which mechanism forms a tarn as a glacier retreats from a cirque?
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