A swift current occurring in a narrow passage connecting two large bodies of water, which is produced by the continuously changing difference in height of tide at the two ends of the passage, is called a __________.
• Tidal currents caused by water level differences between two larger bodies of water • How constricted passages (narrows, inlets) can speed up water flow, similar to a nozzle • The difference between currents that move back-and-forth in a line versus those that move in a circular or rotating pattern
• Which choice best describes a strong flow created specifically by a difference in water level (head) between two areas connected by a narrow channel? • Think about what happens when water is forced through a narrow opening from a higher level to a lower level—what kind of current or flow is that typically called in basic fluid or dam terminology? • Which terms in the options are more about direction of motion (back-and-forth or rotating) rather than about being driven by a height difference?
• Identify which term is commonly associated with flow due to a height (pressure) difference, not just tidal direction changes • Eliminate any terms that mainly describe rotating or circular tidal patterns • Ask yourself which word you might also hear when discussing water flowing rapidly through a dam, spillway, or sluice due to level differences
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