Discussion
Tidal streams in a narrow strait are typically
Answer: B
Correct answer: stronger than in the adjacent open water on either side
Continuity requires the same volume to pass through a smaller cross-section, so the flow accelerates through the constriction. This is why the strongest tidal streams in the world are found in narrow straits - the Pentland Firth and the Strait of Messina among them - and why those are the sites tidal stream turbines are proposed for.
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