Erosional and depositional landforms Flashcards
What does seaward rock strata cause?
Dipping in a cliff.
What width can a shore platform reach and why is this the maximum?
500m, friction slows the waves down and they break before they hit the cliff.
Between what degree can shore platforms slope seaward?
between 0 and 3 degrees.
What are the two types of coastline?
Discordant and concordant.
Give an example of an island with both a discordant and concordant coastline?
Isle of Purbeck
Where do geos typically form and what is the main process in their formation?
On lines of weakness or faults, hydraulic action
Give an example of a geo.
Huntsman’s Leap in Pembrokeshire which is 35m deep.
What % of beach material is from offshore processes, cliffs and rivers?
Offshore and cliffs both 5% and rivers are around 95%
Where can shingle be found on some beaches?
On the upper beach where rapid percolation occurs and there is little backwash.
What gradient can sand beaches range from. What gradient are pebble and cobble beaches?
Sand 1-7 degrees.
Pebble 17 degrees
Cobble 24 degrees
What causes runnels to develop?
The orbital movement of water in waves.
What difference in beach profile is caused by destructive and constructive waves?
Destructive waves cause shallower profiles while constructive cause steeper profiles.
Give an example of a spit.
Orford Ness in East Anglia.
Give an example of a bar and how it was caused
Slapton in Devon- 100m wide and due to no obvious direction of LSD is suspected to be caused due to movement of sediment from Flandrian Transgression.
Give examples of plants that help trap sediment in salt marshes.
Eelgrass and spartina
