Coasts page 11 Quiz A Flashcards
What is mass movement
the downhill movement of sediment that moves because of gravity.
Explain the formation of a rotational slump.
A rotational slump occurs when a slump block, composed of sediment or rock, slides along a concave-upward slip surface with rotation about an axis parallel to the slope
A wavecut platform is…
a wide gently-sloping surface found at the foot of a cliff
In what erosional landform do you find a wave cut notch and overhanging cliff?
on headlands
What erosional landform is caused by differential erosion?
Headlands and Bays
What is a discordant coastline?
Coastlines where the geology alternates between strata (or bands) of hard rock and soft rock
In what erosional landform do you find a stump?
headland
Explain how a wave cut notch is formed
-destructive waves hit against the cliff face
- causing an undercut between the high and low water marks,
-mainly as a result of abrasion, corrosion and hydraulic action
What is offshore?
The area of deeper water beyond the point at which waves begin to break. Friction between the waves and the sea bed may cause some distortion of the wave shape.
What is near shore
The area of shallow water beyond the low tide mark, within which friction between the seabed and waves distorts the wave sufficiently to cause it to break. (breaker zone) There may be a breakpoint bar between the offshore and nearshore zones.
What is foreshore
The area between the high tide and the low tide mark
What is backshore?
The area above the high tide mark, affected by wave action only during major storm events.
What type of waves cause a sandy beach?
Constructive waves
What type of waves cause a pebble beach?
Destructive waves
What is a sand dune
a mound of sand formed by the wind
