Coastal ErosionCoastal ErosionWe already know how waves erode We already know how waves erode

the coastline.the coastline.The aims of today is to look at some of the The aims of today is to look at some of the

landforms they create through;landforms they create through;ErosionErosionDeposition Deposition and transportation and transportation

Erosional FeaturesErosional Features

The more powerful the waves – the more The more powerful the waves – the more energy they have – and the softer the energy they have – and the softer the

rock, the faster the erosion will be.rock, the faster the erosion will be.

Waves (just like rivers) erode Waves (just like rivers) erode the land by one of 4 processesthe land by one of 4 processes

The constant force of waves crashing on the shore The constant force of waves crashing on the shore damages it. This is called damages it. This is called hydraulic actionhydraulic action..

Waves bring with them bits of rock and sand. These Waves bring with them bits of rock and sand. These help to grind down cliffs. This is called help to grind down cliffs. This is called abrasionabrasion. .

Waves cause rocks and pebbles on the shore to Waves cause rocks and pebbles on the shore to smash into each other and break down. This is smash into each other and break down. This is called called attritionattrition. .

Acids contained in sea water will slowly dissolve Acids contained in sea water will slowly dissolve certain types of rock. This is called corrosion or certain types of rock. This is called corrosion or solutionsolution. .

cliffcliff

crackcrack

cavecave

archarch

pillarpillar

stackstack

stumpstump

Wave cut notch Wave cut notch

or or wave cut wave cut platformplatform

(sometimes may be (sometimes may be called a reef)called a reef)

coastalcoastal retreatretreat

as the processes as the processes continues the continues the cliff/headland cliff/headland continues to retreat continues to retreat (move backwards)(move backwards)

Case StudiesCase Studies

Make sure you can name and locate Make sure you can name and locate examples for this type of erosional examples for this type of erosional landform.landform.

The most famous are;The most famous are; Old Harry DorsetOld Harry Dorset The 12 Apostles, Eastern AustraliaThe 12 Apostles, Eastern Australia