Coastal Processes (OCR GCSE Geography A (Geographical Themes)): Flashcards
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Practise the cards
15 cards from this deck
Hydraulic action
Hydraulic action
Waves smash cliff, force air into cracks, break rock apart
Abrasion erosion
Abrasion erosion
Rock fragments hurled at cliff base like sandpaper
Attrition process
Attrition process
Rock fragments rub underwater, knock bits off continually
Solution erosion
Solution erosion
Seawater dissolves chalk and limestone
Freeze-thaw weathering
Freeze-thaw weathering
Water in cracks freezes, expands, splits rock
Chemical weathering at coasts
Chemical weathering at coasts
Weak acid in rainwater/seawater dissolves limestone/chalk
Suspension transport
Suspension transport
Particles carried suspended within the water
Traction transport
Traction transport
Large pebbles rolled along seabed by currents
Saltation transport
Saltation transport
Pebbles bounce along sea bed
Fetch
Fetch
Distance waves travel
Constructive waves
Constructive waves
Low waves, powerful swash, construct beach, large fetch
Destructive waves
Destructive waves
Local storms, erode beach, stronger backwash than swash
Mass movement
Mass movement
Rocks shift down slope when gravity > support force
Rockfalls
Rockfalls
Bits of rock fall due to freeze-thaw weathering
Slumps
Slumps
Saturated soil slumps down a curved surface