Coastal Defence Scheme Quiz

What causes the formation of a spit?

• Prevailing winds

• Tides

• Underwater earthquakes

• Volcanic activity

What is the purpose of wooden groynes in coastal defence?

• To absorb wave energy

• To prevent longshore drift

• To trap sediment

• To create a salt marsh

Which coastal defence structure refracts the energy of breaking waves?

• Concrete sea wall

• Rip rap

• Wooden groynes

• Salt marsh

What is the main purpose of rip rap in coastal defence? (choose 2)

• To absorb wave energy

• To prevent longshore drift

• To trap sediment

• To protect cliffs from erosion

What is a potential drawback of coastal defences?

• They are ineffective against destructive waves

• They are expensive to build and maintain

• They cause increased erosion

• They have no impact on cliff stability