Coasts as natural systems — AQA A-Level Geography
Test yourself on Coasts as natural systems with AQA A-Level practice questions.
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Coasts as natural systems explained
Coastal environments operate as open systems, exchanging both energy and matter with their surroundings.
Read the full explanation
Inputs like solar energy and sediment from rivers drive flows and transfers, such as longshore drift, moving material between stores like beaches and dunes. Outputs include sediment washed offshore. When inputs equal outputs, the system achieves dynamic equilibrium. Disturbances trigger feedback: positive feedback amplifies change (e.g., storm erosion removing vegetation, leading to further dune loss), while negative feedback dampens it (e.g., cliff collapse creating a protective scree slope). A landform is an individual feature, like a stack or spit. Related landforms combine to create a characteristic landscape, such as a coastal plain featuring spits, salt marshes, and lagoons working together.
Your focus
- Identify and categorise the inputs, outputs, stores, and flows within a specific coastal system.
- Explain the mechanisms of positive and negative feedback in maintaining or disrupting dynamic equilibrium.
- Differentiate between individual landforms and the broader characteristic landscapes they combine to create.
Coasts as natural systems exam tips
Marking Points
- Define coasts as open systems with inputs (sediment, energy), outputs (sediment loss), stores (beaches), and flows (longshore drift).
- Explain dynamic equilibrium as the balanced state where inputs and outputs are equal, maintaining a stable coastal system over time.
- Distinguish between positive feedback (amplifying change, e.g., blowout development in dunes) and negative feedback (restoring balance, e.g., beach profiling during storms).
- Differentiate a landform (an individual relief feature like a wave-cut platform) from a landscape (a broader area comprising multiple interacting landforms).
- Illustrate how landforms combine into landscapes, such as a headland, cave, arch, and stack sequence forming a high-energy rocky coastal landscape.
Examiner Tips
- 💡Always use specific coastal examples when defining systems terminology, such as citing a beach as a sediment store.
- 💡When discussing dynamic equilibrium, explain the specific mechanisms of negative feedback that help restore the balance after a storm event.
- 💡Structure landscape answers by showing the spatial and genetic relationships between individual landforms, like how a spit shelters a salt marsh.
Common Mistakes
- Confusing positive and negative feedback; correction: positive feedback amplifies a change away from equilibrium, whereas negative feedback restores the system to its original state.
- Using 'landform' and 'landscape' interchangeably; correction: a landform is a single distinct feature (e.g., a spit), while a landscape is the wider visual and physical environment made of multiple landforms.
- Assuming coastal systems are closed; correction: coasts are open systems because they transfer both energy (e.g., wave power) and matter (e.g., sediment) across their boundaries.