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Which navigation risk increased for Viking longships sailing far south from Scandinavia into the Mediterranean Sea during summer?

A)Reduced geomagnetic field strength
B)Increased woodworm (shipworm) attacks
C)Unpredictable tidal current changes
D)Erratic variations in celestial positions

💡 Explanation

Woodworm activity increases in warmer waters; therefore, longships in the Mediterranean experienced increased structural damage due to bioerosion. The primary mechanism is xylophagy, because the warmer climate increases the metabolic rate, rather than other climate-related effects.

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