erosion and landforms
Post on 16-May-2015
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Lesson ObjectivesLesson Objectives
This lesson we will be looking at the process of erosion and how it shapes our coastline.
By the end of the lesson you should be able to:• Name the four processes of coastal erosion• Describe what each of these processes is• Explain what landforms result from erosion and
why
Hydraulic ActionHydraulic Action
The force of the water hitting the cliffs, often forcing air pockets
into cracks in the rocks
AbrasionAbrasion
Caused by waves picking up stones and hurling them at the
cliff face, wearing it away.
AttritionAttrition
Any material, but usually rocks and pebbles will become
rounder and smaller over time as it collides with other rocks
and pebbles.
CorrosionCorrosion
The dissolving of rocks and minerals by sea water.
Headland
Bay
Headlands and Bays
Is all to do with geology!
Geology = the type of rock
Soft rocks get eroded quickly creating bays
Hard rocks erode more slowly creating headlands
Headlands and BaysIs all to do with geology!
Geology = the type of rock
Soft rocks get eroded quickly creating bays
Hard rocks erode more slowly creating headlands
Cave, Arch, Stack, StumpCave, Arch, Stack, Stump
Key WordsKey WordsHydraulic Action - The force of the water hitting the cliffs,
often forcing air pockets into cracks in the rocks
Abrasion - Caused by waves picking up stones and hurling them at the cliff face, wearing it away.
Attrition - Any material, but usually rocks and pebbles will become rounder and smaller over time as it collides with other rocks and pebbles.
Corrosion - The dissolving of rocks and minerals by sea water.
Key WordsKey Words
Cave – a fracture in the rock that has been widened to form a deep hole in the cliff
Arch – when two caves meet in the middle a gap is formed in the cliff
Stack – a pillar of rock that is left over when the arch collapses due to gravity
Stump – A small piece of rock that just sticks up out of the ocean; what is left once the stack falls over
Geology – the type of rock
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