4.3 Coastal landscapes Flashcards
What is a concordant coastline?
A coastline with one rock layer parallel to the sea.
What is a disconcordant coastline?
A coastline with alternating types of rock. (E.g. Southampton)
What is a headland?
A rock formation found on disconcordant coasts where a harder rock layer has eroded slower than the softer rock next to it.
What is a bay?
An area where softer rock has eroded leaving a inlet in the coast between two headlands.
What is a lagoon?
A bay that has been closed off from the ocean by a bar.
What is a bar?
A bar is a layer of sand that seals off a lagoon.
What is a spit?
A spit is a layer of sand that stretches out from the mainland into the ocean because of longshore drift they cna have recurved ends.
What is a tombola?
A tombola is a layer of sand conecting an island to the mainland.
How does longshore drift work?
Longshore drift occurs when the waves push sediment at an angle towards the coast and then gravity cause the sediment to be pulled by the shortest root back to the ocean. This means that the sediment slowly moves along the coast.
What are constructive waves?
Waves that have a stronger swash than backwash (deposit sediment).
What are destructive waves?
Waves that have a stronger backwash than swash (erode sediment).
