Physical Environments 2
LITHOSPHERE
COASTAL
Higher
Geography
COASTAL
Higher
Geography
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COASTAL LANDSCAPESLoading...
formation of erosional and depositional features in coastal landscapes:1. Wave Cut Platform
2. Headland and Bay
3. Cave / Arch / Stack
4. Spit
5. Bar
6. Tombolo
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Coastal ProcessesLoading...
1. I can explain how the sea erodes the landscape by the processes of:1. Hydraulic Action
2. Abrasion
3. Attrition
4. Solution
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https://www.twigscotland.com/film/coastal-processes-waves-1118/2.26 minutes
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https://www.twigscotland.com/film/coastal-processes-1152/2.25 minutes
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Coastal Processes of Erosion
Hydraulic action – force of the waves crashing against the shore and cliffs forces air into cracks in the rock (1), causing the air to implode, the shockwave erodes the rocks (1).
Abrasion – wearing away of cliff by sand, shingle and pebbles (1) hurled against them by waves (1).
Attrition – waves cause eroded material to smash against each other (1). Gradually the eroded material becomes smaller and rounder aiding abrasion (1).
Solution – dissolving of certain rock types (1) by the naturally occurring acid and salt in the sea water (1).
Abrasion – wearing away of cliff by sand, shingle and pebbles (1) hurled against them by waves (1).
Attrition – waves cause eroded material to smash against each other (1). Gradually the eroded material becomes smaller and rounder aiding abrasion (1).
Solution – dissolving of certain rock types (1) by the naturally occurring acid and salt in the sea water (1).
Coastal Processes of Deposition
1. I can explain how the sea shapes the landscape by the processes of:
1. Longshore Drift
1. Longshore Drift
Coastal Processes of Deposition
Longshore Drift
The swash moves up the beach at an angle (1) due to the direction of the prevailing winds (1).
The backwash moves back down the beach at a right angle (1) due to gravity (1).
The swash moves up the beach at an angle (1) due to the direction of the prevailing winds (1).
The backwash moves back down the beach at a right angle (1) due to gravity (1).
1. Wave Cut Platform
Cliffs form where there is harder more resistant rock (1) such as granite / chalk (1).
Wave energy is at its greatest when a high, steep wave breaks at the foot of a cliff (1). Continued erosion causes the notch to become larger over time (1)
Weaknesses such as joints, faults or cracks in cliffs (1) are undercut by erosion to form a wave-cut notch (1) the rock above overhangs over the notch and, as erosion continues, the notch enlarges (1) until the unsupported overhang collapses due to the weight (1).
The new cliff face is then eroded and through time, the cliff retreats inland, leaving a gently-sloping rocky surface called a wave-cut platform (1), which extends out to sea away from the cliff (1).
The platform is abraded by rock materials, with rock pools and potholes forming, evident at low tide (1).
An example of a cliff is Seacombe Cliff (1).
Wave energy is at its greatest when a high, steep wave breaks at the foot of a cliff (1). Continued erosion causes the notch to become larger over time (1)
Weaknesses such as joints, faults or cracks in cliffs (1) are undercut by erosion to form a wave-cut notch (1) the rock above overhangs over the notch and, as erosion continues, the notch enlarges (1) until the unsupported overhang collapses due to the weight (1).
The new cliff face is then eroded and through time, the cliff retreats inland, leaving a gently-sloping rocky surface called a wave-cut platform (1), which extends out to sea away from the cliff (1).
The platform is abraded by rock materials, with rock pools and potholes forming, evident at low tide (1).
An example of a cliff is Seacombe Cliff (1).
1. Wave Cut Platform
