Types of Erosion
What is attrition?
When particles of sediment rub against each other in a wave, becoming smaller and rounder over time
What is a Cave?
Partially eroded cliff with one side as an opening
True or False - a Bay forms on soft rock
True
this activity at the beach includes sunscreen and a board, what am I?
swimming, surfing
What are groynes?
structures on the coast built to capture sand
What is abrasion?
The sandpaper type effect of sediment in a wave smoothing rock and cliffs as the wave brushes against it
What kind of landform is a Godley head?
Headland
An example of a spit in Canterbury is
Kaitorete Spit
What is a megacity?
a city with 10 million people in it
What are seawalls?
Structures built by the coast to try and prevent flooding or slow down tsunami
What is hydraulic action?
When a wave forces air into the rock and causes it to crack and break
What is a wave cut platform?
A flat area beside a cliff which has been eroded severely by waves
New Brighton Beach is famous for this man made structure
Pier
Name 3 Canterbury beaches
Corsair Bay, Taylor's Mistake, Sumner, New Brighton etc
What is one way you can naturally build up sand dunes?
plant them with special grasses
What is corrosion?
When salt compounds in seawater corrode metals in rock ( essentially causing a rust type of effect)
which erosional landform is like a natural bridge?
An Arch
What is the name of the feature which has large mounds of fine sand on the beach or dry ground?
Sand dune
Ashburton/ South Canterbury
True or False: Beach nourishment is considered hard engineering
False. Considered soft engineering as you are not building anything new, you are adding sediment to a beach
What is the difference between abrasion and attrition?
Abrasion is when sediment in a wave has friction against the cliff as it is hurled. Attrition is within the wave where sediments are jumbled around becoming smaller over time
What is the difference between a stack and a stump?
a stump is an eroded stack, a stack is a pillar of cliff seperated from the mainland
Longshore drift is when...
a parallel current transports sediment along the coast
What is managed retreat?
When people slowly start building away from the coast over time to allow nature to take its course