Edexcel A-Level Geography Physical Systems and Sustainability: a complete overview of the water cycle, carbon cycle and climate change

What Physical Systems and Sustainability actually demands

Physical Systems and Sustainability is the systems-and-sustainability core of Edexcel A-Level Geography. Area of Study 3 runs from the global water cycle, through the carbon cycle and energy, to the climate change that the two cycles drive. The examiners test two linked skills: precise understanding of stores, fluxes and feedbacks, and the confident application of systems concepts, data and located examples in Paper 1.

This guide walks through the topics, then sets out the exam patterns Edexcel repeats. Each topic has a matching dot-point page with practice questions; this overview ties them together.

The water cycle and water insecurity

The Water Cycle and Water Insecurity sets up the systems framework: the global water cycle as a closed system of stores and flows, and the drainage basin as an open subsystem with a water budget. It explains the physical and economic causes of water insecurity, the conflicts over a finite resource, and hard and sustainable management including integrated water resource management.

The carbon cycle and energy security

The Carbon Cycle and Energy Security covers the carbon cycle as a system of stores and fluxes with fast and slow components and the biological and physical pumps, human disruption through fossil fuels and deforestation, the meaning and drivers of energy security, the changing energy mix and pathways, and the links between carbon, energy and sustainability.

Climate change and the future

Climate Change and the Future draws the cycles together: the evidence and causes of a changing climate, the feedbacks (ice-albedo, permafrost, water vapour) that link the water and carbon cycles, the projected physical and human consequences for places, and the mitigation and adaptation strategies needed for a sustainable future.

How Physical Systems and Sustainability is examined

A typical Edexcel profile for this area of study in Paper 1:

• Data-response and short answer. Interpreting graphs, models, maps and figures, defining terms, and describing patterns and trends.
• Process explanation. Explaining stores, fluxes and feedbacks and how human activity disrupts the cycles.
• Case-study and data application. Using located examples for water insecurity, energy security and climate responses.
• Synoptic and extended essays. The 12 and 20 mark questions reward linking the cycles to climate, evaluation and a supported conclusion.

Check your knowledge

A mix of recall and application questions covering Physical Systems and Sustainability. Attempt them, then check against the solutions.

1. State the drainage-basin water-budget equation. (2 marks)
2. Distinguish between physical and economic water scarcity. (2 marks)
3. Name the largest carbon store on Earth. (1 mark)
4. Distinguish between the fast and slow carbon cycles. (2 marks)
5. Define energy security. (2 marks)
6. Name two pieces of evidence for climate change. (2 marks)
7. Explain how the ice-albedo effect acts as a positive feedback. (3 marks)
8. Distinguish between mitigation and adaptation. (2 marks)