Mass flow of water induced by the raising or lowering of sea level owing to passage of tidal crests or troughs.

• A. Perigee
• B. Tidal Current
• C. Solar Tide
• D. Spring Tide

Answer: (B)

Tidal currents describe the horizontal movement of seawater driven by the rise and fall of tides as tidal crests and troughs pass a location. When the tide rises, water moves toward the coast (a flood current); when the tide falls, water moves away (an ebb current). This ongoing flow—mass movement linked to changing sea level from tides—is best captured by the term tidal current.

Perigee is about the Moon’s closest point in its orbit and isn’t about water movement. A solar tide refers to the Sun’s gravitational effect on tides, which contributes to tidal patterns but doesn’t name the actual water flow. A spring tide describes the condition of unusually high high tides and low low tides due to alignment of Sun and Moon, which can amplify currents but does not define the flow mechanism itself.