Geography Coasts Coastal Erosion [Date] Today I will:
Geography Coasts Coastal Erosion [Date]
Today I will: - Know the key terms - Know how a bay and wave cut platform is formed Geography Coasts
Processes of Erosion at the Coastline 1. Hydraulic Action: Waves crash against a cliff and drive water under great pressure into cracks in the rock. This pressure squeezes the air and as the wave falls back the air expands explosively, loosening pieces of rock. 2. Corrasion: Corrasion (or abrasion) occurs when stones and pebbles are picked up by waves and thrown against the cliff, causing erosion. 3. Solution: Salty sea water chemically dissolves rocks. This is most noticeable
on chalk and limestone cliffs. 4. Attrition: Rock fragments (stones and pebbles) hit against each other and so are reduced in size. Geography Coasts
The force of the swash and backwash determines whether the waves are constructive waves or destructive waves. Swash: The water which rushes up the
beach is called swash. Backwash: As the wave loses its momentum, energy is transferred back to the sea this
return flow is called backwash. Geography Coasts If the swash is weaker than the backwash (destructive wave), very little
material is carried up the beach. With a strong backwash, material will be removed and the beach will decrease in size. Geography Coasts Wave-cut platform
Important note: . This file contains the presentation used at the Senate meeting. The president's informal notes have been added in red.. These notes have not been reviewed nor have they been approved by the Academic Senate; they were created...
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