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Geography C2 Unit 6(Landform Features Found at the Coasts) (Major Features…
Geography C2 Unit 6(Landform Features Found at the Coasts)
Major Features of Coastal Erosion
Sea Cliff/Wave-cut Platform
Sea Cliff
Steep Rock Face
Destructive Waves+Hydraulic Action+Abrasion
Prolonged Undercutting--->Notch
Overhanging Roof Collapsed/Retreated--->Sea Cliff+Wave-cut Platform
East of Sai Kung
Wave-cut Platform
Gently Sloping Rock Surface(Exposed at Low Tide)
Tung Ping Chau
Mirs Bay
Sea Cave
Passage/Tunnel Extending Landwards
Destructive Wave+Hydraulic Action+Abrasion Attacking Foot of Cliff
Areas with Lines of Weakness(Joints/Cracks/Bedding Planes)/Composed of Less Resistant Rocks Eroded
Sea Cliff Opened up--->Prolonged Wave Action--->Sea Cave
Ninepin Group
Sea Arch
Wave-eroded Passage through a Headland
Sea Cave Cutting through the Headland
Tunnel Widened--->Rock Bridge--->Sea Arch
Ninepin Group
Stack
Isolated Rock Separated from the Mainland
Foot of the Sea Arch Eroded--->Roof of the Arch Collapsed
Isolated Island--->Stack
Back-to-back Geos Joining together
Geo
Long/Narrow Inlet on the Face of a Sea Cliff
Continuous Wave Erosion--->Exposion of Sea Cave--->Geo
Pak Lap
Major Features of Coastal Deposition
Beach
A Strip of Land Bondering the Sea/Consisting of Boulders/Pebbles/Sand
Lying Between High Tide/Low Tide Level
Fine Materials on the Seaward Side
Shek O(Sand Beach
Kiu Tsui(Pebble Beach)
Tap Mun(Boulder Beach)
Coarsest Materials near the Top of the Beach
Offshore Bar
Long Narrow Ridge Lying away from/Parallel to a Coast
Not Joined to the Land
Gently Sloping Coast--->Weak Backwash
Low Sand Ridge offshore
Continuous Piling up--->Offshore Bar+Lagoon
Spit
Long/Narrow Accumulation of Sand(One end to the mainland+One End into the Sea/across an Estuary) with a Hooked End
Longshore Drift Transporting Beach Materials
Coastline Direction Changed--->Deposition--->Curved Spit
Longshore Drift--->Extension of Spit--->Swamp(Landward side of the Spit)
Wind Direction Changed--->Hooked End
Bay-bar
Long Ridge of Sand/Pebbles Running Parallel to the Coastline across a Bay
Spit Extension by Longshore Drift
Two Spits Joined
Findhorn Bay
Tombolo
Narrow Piece of Land(Extension of Spit/Bar Between Offshore Island&Mainland/Two Island)
Sediments to Both Islands Brought by Longshore Drifts
Continuous Longshore Drift--->Extension of Spit--->Joining together--->Tombolo
Cheung Chau