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← HistoryWhich 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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