Coastal Processes (AQA GCSE Geography): Flashcards
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15 cards from this deck
Hydraulic Action
Hydraulic Action
Waves smash into cliffs, forcing air into cracks, breaking rock apart
Abrasion in coastal erosion
Abrasion in coastal erosion
Waves hurl rock fragments at cliff base like sandpaper, eroding it
Attrition
Attrition
Rock fragments rub together underwater, wearing rocks down
Solution (coastal erosion)
Solution (coastal erosion)
Seawater chemically dissolves rocks like chalk & limestone
Freeze-thaw weathering process
Freeze-thaw weathering process
Water in cracks freezes, expands, widens crack until rock splits
Chemical weathering on coasts
Chemical weathering on coasts
Weak acid in rainwater/seawater dissolves limestone or chalk
Biological weathering
Biological weathering
Plant roots grow in cracks, making them larger, breaking rock
Suspension (transportation)
Suspension (transportation)
Particles carried suspended within the water
Traction
Traction
Large pebbles rolled along the seabed by currents
Saltation
Saltation
Turbulence lifts pebbles which bounce along the sea bed
Fetch
Fetch
Distance waves travel across open water
Constructive waves characteristics
Constructive waves characteristics
Low waves, powerful swash, construct beach, large fetch
Destructive waves characteristics
Destructive waves characteristics
Steep, plunging, stronger backwash, erode beach, local storms
Mass movement
Mass movement
Rocks shift down slope when gravity force exceeds support force
Slumps (mass movement)
Slumps (mass movement)
Saturated soil slumps down a curved surface