Across the Iberian Peninsula, which consequence follows from a gradual dialect transition zone containing numerous isoglosses with overlapping distributions?

💡 Explanation

Mutual intelligibility across dialect continua changes gradually due to the cumulative effect of numerous isoglosses that define the transition zone. Because the dialectal differences accumulate incrementally, a speaker understands their neighbors, but those further away, less well. Therefore, intelligibility shifts gradually, rather than through a sharp divide, because of the diffusion and overlap of linguistic features.

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