coastal landforms P1

Cards (32)

  • What coastal landforms are discussed in part one of this geography video?
    Discordant/concordant coastlines, headlands/bays, caves/arches/stacks
  • What influences the erosional landforms that develop on a coastline?
    Rock types and geological structures
  • How are discordant coastlines arranged?
    Bands of hard/soft rock at right angles
  • How are concordant coastlines arranged?
    Altering bands of rock parallel to the coast
  • Along what type of coastline do headlands and bays form?
    Discordant coastlines
  • How do headlands and bays form?
    Erosion of alternating resistant and less resistant rock
  • What is the general shape of a bay?
    Gentle slope
  • Where does wave erosion primarily occur on a cliff?
    At the foot of the cliff
  • What geological feature is formed due to wave erosion at the base of a cliff?
    A wave cut notch
  • How does the undercutting of a cliff lead to the formation of a wave cut platform?
    Causes the rock above to collapse
  • What is left behind as a cliff retreats due to repeated erosion and collapse?
    A wave cut platform
  • Where are beaches typically located?
    Between high and low water marks
  • What type of waves are responsible for the formation of beaches?
    Constructive waves
  • What are the two main types of beaches discussed?
    Sandy and shingle
  • What kind of waves create sandy beaches?
    Low energy waves
  • Describe the general characteristics of sandy beaches.
    Flat and wide
  • Why do low energy waves create gentle slopes on sandy beaches?
    Weak backswash moves sand back
  • What kind of waves form shingle beaches?
    High energy waves
  • Describe the shape of shingle beaches?
    Steep and narrow
  • What happens to sand particles on a shingle beach?
    They are washed away
  • Where do spits typically form?
    At sharp bends in the coastline
  • What is the primary process responsible for the formation of spits?
    Longshore drift
  • How do strong winds and waves affect the shape of a spit?
    Curve the end forming a recurved end
  • What happens in the sheltered area behind a spit?
    Material accumulates, flats are able to grow
  • What type of coastal feature can develop behind a spit over time?
    A mud flat or a salt marsh
  • How does a bar form?
    When a spit joins two headlands together
  • What is created when a bar cuts off a bay from the sea?
    A lagoon
  • Under what coastal conditions do offshore bars form?
    Gentle slope
  • What causes waves to deposit sediment offshore, forming an offshore bar?
    Friction with the seabed causes waves to slow down
  • How does longshore drift contribute to the formation of sand dunes?
    Deposits sand that is moved up the beach
  • What causes sand to be deposited, forming embryo dunes?
    Obstacles cause wind speed to decrease
  • What role do plants play in the stabilization of embryo dunes?
    Roots of vegetation stabilize dunes