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.