The predictable daily rise and fall of the ocean at a single point is called what?

• A. The tide
• B. The surge
• C. The current
• D. The wave

Answer: (A)

Tides are the predictable daily rise and fall of sea level at a single location. This happens because the Moon and Sun exert gravity on Earth’s oceans, creating bulges. As the Earth rotates, shorelines move in and out of these bulges, producing high tides when a bulge is near and low tides when it isn’t. The other terms describe different phenomena: a surge is a temporary water level rise often tied to storms, a current is the horizontal flow of water, and a wave is a moving disturbance on the water surface. Tides are predictable and charted, which is helpful for planning dives and boating activities around shorelines.