Coasts and Coastal Processes
Waves shape cliffs, beaches and spits.
About this topic
Waves shape coasts, and they are driven by wind blowing over the sea. Erosion by hydraulic action, abrasion and attrition forms cliffs, wave-cut platforms, caves, arches, stacks and stumps. A crack in a headland is enlarged into a cave, then breaks through as an arch; when the roof collapses a stack remains, which eventually erodes to a stump. Longshore drift transports sediment along the shore in a zigzag, building beaches, spits and bars; deposition occurs in sheltered areas.
Constructive waves have a strong swash and weak backwash, so they build up beaches, while destructive waves have a strong backwash and remove material. Longshore drift works because waves approach at an angle, carrying sand up the beach diagonally, while gravity pulls it back straight down. Features like Spurn Head and Chesil Beach in Britain show these processes at work.
Coastal management includes hard engineering (sea walls, groynes, rock armour) and soft engineering (beach nourishment, managed retreat). Hard methods are costly and can shift erosion elsewhere, while soft methods work with nature. Rising sea levels and storms increase risks. Coasts support ports, tourism, fishing and ecosystems like mangroves and dunes, so decisions involve balancing cost, people and the environment.
Key ideas
- Erosion forms arches and stacks
- Deposition builds beaches
- Longshore drift moves sand
Quick check
Use cases: where Coasts and Coastal Processes helps
- Homework: review the key idea behind Coasts and Coastal Processes before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Coasts and Coastal Processes without notes.
- Visual learning: play with the interactive lab to see how Coasts and Coastal Processes changes when you adjust its inputs.
- Teaching a friend: explain Coasts and Coastal Processes in your own words, then compare your version with the key ideas.
Geography helps with city planning, climate, trade and migration.
Frequently asked questions
What is Coasts and Coastal Processes?
Waves shape cliffs, beaches and spits.
What will I learn in Coasts and Coastal Processes?
Erosion forms arches and stacks. Deposition builds beaches. Longshore drift moves sand.
Is Coasts and Coastal Processes part of Geography?
Yes. It is one of 40 Geography topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Coasts and Coastal Processes lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Coasts and Coastal Processes?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.