Landforms of Coastal Erosion Flashcards

All 7 cards in this deck

Why do headlands and bays form along a discordant coastline?

Softer, less resistant rock is eroded more quickly to form bays; harder, more resistant rock is left jutting out as headlands.

What does wave refraction do to wave energy around a headland?

It focuses (concentrates) wave energy on the headland and spreads it out in the bays.

What is a wave-cut platform, and how is it left behind?

A flat rocky surface at the base of a cliff, left as a wave-cut notch undercuts the cliff, which collapses and retreats.

Which landform is left when the roof of an arch collapses, and what does it become later?

A stack; continued erosion makes it collapse into a stump.

True or false? Chalk cliffs are eroded faster than boulder clay cliffs.

False. Chalk is harder/more resistant, so it is eroded more slowly; soft boulder clay erodes rapidly.

How does a cave on a headland become an arch?

Waves keep eroding the cave (mainly by hydraulic power and abrasion) until it cuts right through the headland, often meeting a cave on the other side, leaving an arch.

How does rock type affect the shape of a cliff?

Resistant (hard) rock forms steep, near-vertical cliffs; weak (soft) rock forms gentler, sloping cliffs.