Coasts – True or false

Waves erode the side of a cliff, forming a cave. When the cave breaks through to the other side, an arch is created. If the arch collapses, it leaves behind a sea stack, a tall column of rock.

What is the initial effect of waves on a cliff?

• They deposit sand.

• They wear away the side of the cliff.

• They form an arch.

• They create a sea stack.

What structure is formed when a cave breaks through to the other side?

• A sea stack

• A beach

• An arch

• A cliff

What remains after an arch collapses?

• A cliff

• A sea stack

• A cave

• A new arch

Which of the following is a result of continued erosion on a cliff?

• Development of a sand dune

• Creation of a sea stack

• Growth of a coral reef

• Formation of a beach

What is the sequence of formations due to coastal erosion?

• Sea stack, cave, arch

• Cave, arch, sea stack

• Arch, sea stack, cave

• Cliff, beach, dune