ChestertonCC - Geo - Changing Coasts - defences

What are sea walls?

• Concrete barriers built along a beach.

• Adding sediment to a beach.

• Piles of boulders along a beach.

• Planting grass to trap wind-blown sand.

What shape are sea walls?

• straight

• sloping down

• sloping up

• curved

How do sea walls defend the land from erosion?

• Reflect the energy of waves.

• Absorb the energy of waves.

What is rock armour?

• Concrete barriers built along a beach.

• Adding sediment to a beach.

• Piles of boulders along a beach.

• Planting grass to trap wind-blown sand.

Which of these rocks could be used for rock armour?

• sandstone

• granite

• clay

How does rock armour defend the land from erosion?

• Reflect the energy of waves.

• Absorb the energy of waves.

What is beach nourishment?

• Concrete barriers built along a beach.

• Adding sediment to a beach.

• Piles of boulders along a beach.

• Planting grass to trap wind-blown sand.

Wide beaches are good at absorbing the energy of waves.

• True

• False

What is dune regeneration?

• Concrete barriers built along a beach.

• Adding sediment to a beach.

• Piles of boulders along a beach.

• Planting grass to trap wind-blown sand.

What type of grass is planted to form sand dunes?

• Moroccan grass

• marram grass

• meadow grass

• lemon grass