____ is the underwater movement of water caused by wave action that you will experience when diving in areas close to shore.

• A. Surge
• B. Currents
• C. Tide
• D. Turbulence

Answer: (A)

Surge is the underwater movement of water caused by wave action near shore. When waves break close to the shore, they shove water toward the shore and then draw it back as the energy of the wave dissipates, creating a rhythmic back-and-forth flow. This differs from currents, which are steady directional flows driven by wind or density differences, and from tide, which is the regular rise and fall of water levels over hours due to gravity. Turbulence refers to chaotic, swirling motion around obstacles.

In practice, surge can push you toward the bottom or away from the shore with each wave, so you learn to anticipate the cycle, fine-tune your buoyancy, and move with the water instead of fighting it.