Correct, constructive waves have a powerful swash, destructive waves have a powerful backwash, constructive waves build up a beach, destructive waves erodes beach, constructive wave crests are far apart, destructive wave crests are close together, groynes are used to prevent sediment moving along the beach, constructive waves have a low wave height, destructive waves have a large wave height, Incorrect, constructive waves have a powerful backwash, destructive waves have a powerful baskswash, destructive waves have a powerful swash, destructive wave crests are far apart, constructive wave crusts are close together, groynes are made to help sediment to move along the beach, constructive waves have a large wave height, destructive waves have a low wave height

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