Final answer:
Refraction causes bays, near headlands, to be areas of powerful deposition surfing and sites of dangerous erosion.
Step-by-step explanation:
Refraction causes bays, near headlands, to be areas of Powerful, deposition surfing and sites of Dangerous, erosion.
As waves approach the coast, they change direction due to the change in water depth and the bending of waves is known as refraction. This can result in increased wave energy at headlands, causing erosion and deposition of sediment in bays.