Pearson Edexcel International GCSE Geography 4GE1
Every core framework, formula, and case-study technique for Edexcel IGCSE Geography — physical processes, human geography models, fieldwork skills, and Paper 1 & Paper 2 exam strategies.
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Aligned with the latest 2026 syllabus and board specifications. This sheet is prepared to match your exam board’s official specifications for the 2026 exam series.
Edexcel IGCSE Geography (4GE1) rewards students who can apply geographical models, calculate key statistics accurately, and structure case-study answers with precise place-specific detail. This reference sheet gives you the formulas, frameworks, and exam technique to handle every command word with confidence.
Physical geography processes — rivers, coasts, tectonics, weathering
Human geography models — DTM, urbanisation, land-use models
Numeric formulas — population density, natural increase, hydrograph lag
Fieldwork skills — sampling methods, hypotheses, data presentation
Apply the correct process vocabulary and link landforms to the processes that create them.
Erosion, transport, and deposition shape river landforms across the long profile.
Erosion
Hydraulic action, abrasion, attrition, solution (corrosion) Transport
Traction, saltation, suspension, solution Deposition
Occurs when river loses energy — on inside of meanders, at the mouth, after floods Drainage basin system: inputs (precipitation) → stores (interception, soil moisture) → flows (throughflow, overland flow) → outputs (evapotranspiration, channel flow).
Storm hydrographs show how a river responds to a rainfall event.
Lag time
Lag time = time of peak discharge − time of peak rainfall Short lag time
Steep slopes, impermeable rock, urbanised catchment, saturated soil Long lag time
Gentle slopes, permeable rock, vegetated catchment, dry antecedent conditions Wave type controls whether a coast is dominated by erosion or deposition.
Constructive waves
Low frequency, long wavelength, strong swash → build beaches Destructive waves
High frequency, short wavelength, strong backwash → erode coasts Erosion landforms
Headlands & bays → caves → arches → stacks → stumps; wave-cut platforms Deposition landforms
Beaches, spits, bars, tombolos, salt marshes Longshore drift
Swash moves sediment up beach at angle of prevailing wind; backwash returns it perpendicular to coast Plate boundaries explain the global distribution of earthquakes and volcanoes.
Destructive (convergent)
Oceanic-continental: subduction → composite volcanoes, deep earthquakes, ocean trenches (e.g. Andes). Continental-continental: collision → fold mountains (e.g. Himalayas) Constructive (divergent)
Plates move apart → shield volcanoes, shallow earthquakes, mid-ocean ridges (e.g. Mid-Atlantic Ridge) Conservative (transform)
Plates slide past → shallow but powerful earthquakes, no volcanoes (e.g. San Andreas Fault) Weathering breaks down rock in situ — distinct from erosion.
Physical (mechanical)
Freeze-thaw, exfoliation (onion-skin), salt crystallisation Chemical
Carbonation (limestone + carbonic acid), oxidation, hydrolysis, solution Biological
Root action, burrowing animals, organic acids from decomposing plants Models help you describe and explain population change and urban structure.
Five-stage model linking economic development to birth and death rates.
Stage 1 (High Stationary)
High BR, high DR, low/stable population — pre-industrial societies Stage 2 (Early Expanding)
High BR, falling DR — rapid growth (many LEDCs) Stage 3 (Late Expanding)
Falling BR, low DR — slowing growth (NICs) Stage 4 (Low Stationary)
Low BR, low DR — stable population (most MEDCs) Stage 5 (Declining)
BR below DR — natural decrease (e.g. Japan, Germany, Italy) Lee's model: people move when pull factors at the destination outweigh push factors at origin, minus intervening obstacles.
Push factors
Unemployment, poverty, conflict, persecution, natural disasters, lack of services Pull factors
Better jobs, higher wages, education, healthcare, safety, family reunification Intervening obstacles
Cost of travel, immigration policy, language, distance, cultural differences Urbanisation = increasing proportion of population living in towns and cities.
Drivers
Rural-urban migration + natural increase in cities + reclassification of settlements Megacity definition
City with 10 million+ inhabitants (e.g. Tokyo, Delhi, Mumbai, Lagos, São Paulo) Common challenges
Housing shortages, informal settlements, traffic congestion, air pollution, waste management, water supply Two classic models for understanding internal city structure.
Burgess Concentric Zone Model
1. CBD → 2. Zone of transition (factories, low-cost housing) → 3. Working-class housing → 4. Middle-class residential → 5. Commuter zone Hoyt Sector Model
Land uses develop in sectors/wedges along transport routes radiating from the CBD; high-class housing avoids industrial sectors Both are MEDC models — LEDC cities often have wealthy CBDs surrounded by informal settlements on the periphery (inverse pattern).
Calculations you must be able to perform accurately under exam conditions.
Population density = total population ÷ total land area (people per km²) CBR
(Number of live births in a year ÷ total population) × 1000 — expressed per 1000 people per year CDR
(Number of deaths in a year ÷ total population) × 1000 — expressed per 1000 people per year Natural increase rate (%) = (CBR − CDR) ÷ 10 If positive: population grows naturally. If negative: population declines naturally (excludes migration).
IMR = (deaths of infants under 1 year ÷ live births in the same year) × 1000 A key indicator of healthcare quality and overall development.
Economic
GDP per capita, GNI per capita, % employed in primary/secondary/tertiary sectors Social
Life expectancy, IMR, literacy rate, access to safe water, doctors per 1000 Composite
HDI (Human Development Index) — combines income, education, life expectancy Understand the structure of economies and the forces linking them globally.
Shows how the balance between economic sectors changes with development.
Primary
Extracting raw materials — farming, fishing, mining, forestry (dominant in pre-industrial economies) Secondary
Manufacturing — turning raw materials into finished products (dominant in industrial economies) Tertiary
Services — retail, education, healthcare, tourism (dominant in post-industrial economies) Quaternary
Knowledge-based — research, IT, finance (growing in advanced economies) Increasing interconnection of economies, cultures, and societies.
Drivers
Transport (containerisation, air freight), ICT (internet, fibre-optic cables), trade liberalisation (WTO), TNCs Impacts on LEDCs
FDI and jobs vs. exploitation, environmental degradation, cultural homogenisation, race to the bottom Impacts on MEDCs
Cheaper consumer goods, deindustrialisation, structural unemployment in old industrial regions Frame environmental problems with clear cause-effect-response structures.
Rising global mean surface temperature, retreating glaciers, sea-level rise, ocean acidification, increased frequency/intensity of extreme weather (droughts, floods, tropical storms), shifting biome ranges Anthropogenic
Burning fossil fuels (CO₂), deforestation (reduced carbon sink), agriculture (CH₄ from livestock and rice paddies, N₂O from fertilisers) Natural
Volcanic activity, solar variation, Milankovitch cycles (long-term) Sustainable development meets present needs without compromising future generations.
Three pillars: Environmental (protect ecosystems) + Economic (viable livelihoods) + Social (equitable access) Strategies
Renewable energy, recycling, sustainable agriculture, reforestation, green transport, circular economy Edexcel rewards clear hypotheses, justified sampling, and accurate data presentation.
A testable statement about an expected geographical pattern.
Format: 'X will increase/decrease/vary as Y changes' — e.g. 'River velocity will increase downstream' Always have a null hypothesis (no relationship) to test against.
Random
Each member of population has equal chance of selection (random number tables/grid coordinates) — avoids bias but may miss small subgroups Systematic
Selection at regular intervals (e.g. every 10 m along a transect) — easy to apply, ensures coverage Stratified
Population divided into groups, then sampled proportionally — ensures all subgroups represented (e.g. land-use types in a town) Quantitative
Bar charts, line graphs, scatter graphs, pie charts, choropleth maps, isoline maps, located bar/pie charts Qualitative
Annotated photographs, field sketches, transect diagrams, environmental quality surveys Apply command words precisely and back every point with place-specific case-study detail.
Focus on rivers, coasts, hazards, and ecosystems — link processes to landforms and impacts.
Identify the command word (Describe, Explain, Assess) → state the geographical process → use named case studies (e.g. specific river, named earthquake) → quantify with figures (magnitudes, dates, deaths, costs) where possible Focus on population, urbanisation, development, and globalisation — argue with named examples.
Define key terms → apply a relevant model (DTM, Burgess, Clark-Fisher) → use contrasting case studies (one MEDC, one LEDC) → evaluate with judgement (which factor matters most, and why) Describe
State the pattern / what you see — no explanation needed Explain
Give reasons (because, due to, as a result of) Assess / Evaluate
Weigh up factors, reach a justified judgement Suggest
Apply geographical knowledge to propose a plausible reason or solution Boost your Cambridge exam confidence with these proven study strategies from our tutoring experts.
For each topic, lock in one MEDC and one LEDC case study with 6–8 specific facts (place names, statistics, dates). Examiners reward precise, place-specific detail.
Population density, CBR, CDR, natural increase, IMR, and hydrograph lag time all appear regularly. Practice them until they're automatic — small calculation errors lose easy marks.
'Describe' and 'Explain' are not the same. Underline the command word before you write to avoid wasting time on description when an explanation is needed.
Annotated sketches of landforms, hydrographs, and urban models often communicate faster than prose and earn marks for clear labelling.
Quick answers about this free PDF and how to use it for exam revision and active recall.
Yes. This Tutopiya formula sheet is free to use and you can download it as a PDF from this page for offline revision. There is no payment or account required for the PDF download.
This page groups key Geography formulas in one place for revision. Master Pearson Edexcel International GCSE Geography (4GE1) with this 2026 reference sheet. Covers river processes, plate tectonics, urbanisation, population formulas, fieldwork sampling, and Paper 1 & Paper 2 exam tec… Always cross-check with your official syllabus and past papers for your exam session.
No. In the exam you must follow only what your exam board allows in the hall—usually the official formula booklet or data sheet where provided. This page is a revision and teaching aid, not a replacement for board-issued materials.
It is written for students preparing for assessments at Secondary in Geography, including classroom revision, homework support, and independent study. Teachers and tutors can also share it as a quick reference.
Work through past paper questions, quote the correct formula before substituting values, and check units and notation every time. Pair this sheet with timed practice and mark schemes so you see how examiners expect working to be set out.
Explore Tutopiya’s study tools, past paper finder, and revision checklists linked from our tools hub, or book a trial lesson with a subject specialist for personalised support alongside this formula reference.
Work through case studies, fieldwork analysis, and structured exam answers with an experienced Edexcel IGCSE Geography tutor. We focus on accurate process vocabulary, named examples, and command-word technique.
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This reference sheet aligns with Pearson Edexcel International GCSE Geography (4GE1) syllabus content.
Always support geographical arguments with named case studies, accurate statistics, and precise process vocabulary.