Final answer:
Waves in the surf zone behave like shallow-water waves when water depth increases.
Step-by-step explanation:
When waves are in the surf zone, they behave like shallow-water waves when water depth increases. Shallow-water waves are waves that occur when the depth of the water is much smaller than the wavelength of the wave. In this case, as the water depth increases, the waves become more influenced by the ocean floor, causing their behavior to resemble that of shallow-water waves.