Process
Edexcel A-Level Geography 9GE0
Tectonic Processes and Hazards
Topic overviewGlobal distribution of tectonic hazards and plate boundary processesThe structure of the Earth and mantle convectionRidge push, slab pull and sea-floor spreadingDestructive and constructive plate marginsCollision and transform marginsMagma composition and eruption styleThe Benioff zone and earthquake magnitudeSeismic waves and their effectsVolcanic hazards and tsunamisHazard, vulnerability, resilience and the risk equationThe Pressure and Release modelThe impacts of tectonic hazardsMeasuring hazards, and the hazard profileSpeed of onset, areal extent, duration and predictabilityWhy impacts differ between countriesEducation, buildings, healthcare and income as factors in vulnerabilityGovernance at local and national levelPopulation density, isolation and urbanisationHow development level shapes disaster outcomesTrends in tectonic disasters, data reliability and samplingMega-disasters and multiple-hazard zonesTheoretical frameworks for prediction, impact and managementLand-use zoning and hazard-resistant designMonitoring, prediction, preparedness and aid
Glaciated Landscapes and ChangeLandscape
Topic overviewThe cryosphere and the types of glacierGlacial chronology and the causes of climate changeEvidence for Pleistocene ice extentRelict glacial landscapes, and polar against temperate glaciersPermafrost, nivation, frost heave and solifluctionIce wedges, patterned ground, pingos and loessGlacial mass balance and the ice-albedo feedbackAccumulation and ablation processesThe equilibrium line and how glaciers moveWhat controls the rate of glacial movementBasal slip and internal deformationWhat speeds a glacier up or slows it downDebris entrainment, transport and the scale of glacial landformsGlacial erosion, corries, aretes and pyramidal peaksTroughs, hanging valleys, ribbon lakes and roches moutonneesMoraines: lateral, medial, recessional and terminalDrumlins, till plains and the two kinds of tillErratics and reconstructing former ice movementMeltwater pathways, and analysing fluvioglacial sedimentFluvio-glacial (meltwater) landformsThe value of glaciated landscapes to peopleNatural hazards and human threats to glaciated landscapesClimate change and the players who manage these landscapesManagement approaches, legislation and scale
Coastal Landscapes and ChangeLandscape
Topic overviewThe littoral zone and the influences that shape itConcordant and discordant coasts, and geological structureCoastal types and the influence of rock structureFaulting, folding and geological weaknessesRock type, permeability and cliff profilesPsammosere succession on sand dunesHalosere succession and rates of recessionWaves, beach profiles and marine erosionWave-cut notches, platforms and cliffsCaves, arches, stacks and stumpsLongshore drift and the transport of sedimentSpits, bars, tombolos and other depositional landformsSediment cells: sources, transfers and sinksWeathering on the coastMass movement and its landformsRapid coastal recession and variations in its rateCauses of sea level change, and emergent coastlinesSubmergent coastlines and contemporary sea level riseCoastal flooding as a significant and increasing riskLosses from coastal recession, and environmental refugeesHard and soft engineering on the coastIntegrated coastal zone management and shoreline policiesHow coastal management decisions are made, and by whomUsing GIS, photographs and crowd-sourced data in coastal management
Globalisation
Topic overviewWidening, deepening and the global flowsThe five global flows definedTransport, ICT and the shrinking worldPolitical and economic decision making in globalisationMeasuring globalisation: the AT Kearney and KOF indicesTNCs, glocalisation, outsourcing and switched-off placesThe global shift and who gains from itThe social and environmental costs of the global shiftDeindustrialised regions in developed countriesRural-urban migration and the growth of megacitiesGlobal hub cities and international migrationThe costs and benefits of economic migrationCultural diffusion and the spread of a global cultureCultural erosion and opposition to globalisationMeasuring development: GDP, HDI and the Gender Inequality IndexEnvironmental measures, the Gini coefficient and the Lorenz curveGeographical skills: statistics, data and research ethicsWinners, losers and the widening development gapSocial, political and environmental tensions from global changeLocal sourcing and its costs and benefitsFair trade, ethical consumption and recycling
Regenerating PlacesPlaces
Topic overviewEconomic classification and variation from place to placeThe functions of a place and why they changeMeasuring place change and deprivationPast and present connections shaping economic and social characteristicsEconomic and social inequalities changing perceptions of areasLived experience, attachment and conflict over placeEvidence, representations, Spearman's rank and significance testingMeasures of dispersion: range, interquartile range and standard deviationSuccessful regions and the spiral of declinePerceptions of the need for regenerationNational planning, transport and funding decisionsNational policy: Levelling Up, house-building targets and foreign investmentLocal government incentives and inward investmentWhat attracts investment, and the multiplier effectLocal interest groups and tourism, sport and rural regenerationRebranding to change public perception of placesRebranding deindustrialised cities and rural areasEconomic, social and environmental measures of successDeprivation domains and demographic changeHow different stakeholders judge regenerationUrban stakeholders and their criteria for successUrban regeneration: reality, image and contested decisionsRural stakeholders and their criteria for successRural regeneration: reality, image and contested decisions
Diverse PlacesPlaces
Topic overviewPopulation structure variation from place to place and over timePopulation characteristics variation from place to place and over timeGlobal, national and regional influences on placeHow places are represented in film, art, music and mediaContinuity and change in demographic and cultural characterUrban places viewed differently by different groupsIdyllic and negative perceptions of rural placesHow reputation, media and lived experience shape rural viewsEvidence about living spaces, and research ethicsMedia and creative sources, coding and samplingIncreasing cultural and social diversity in the UKWhat causes segregationSegregation along the rural-urban continuum, and migrationPerceptions of segregated places, and measuring segregationLand-use change and tension between residents and newcomersMeasuring integration, and community cohesion in SloughDiverse rural communities: the Lake District
The Water Cycle and Water Insecurity
Topic overviewThe processes of the hydrological cycleThe stores of water and their relative sizeFluxes, residence time, fossil water and the cryosphereThe drainage basin as an open systemWhat influences drainage basin processesWater budgets and river regimesWhat shapes a storm hydrographReading a storm hydrographMeteorological and hydrological drought, ENSO and human causesThe impacts of drought on wetlands and forestsThe physical causes of floodingHuman causes of floodingThe environmental and economic impacts of floodingSocial impacts, case studies and synoptic chartsHow climate change alters the hydrological cycleENSO, uncertainty and future projectionsWater stress, scarcity and the physical causes of insecurityHuman causes of water insecurity and rising demandPhysical and economic water scarcityWhy economic scarcity happens, and the price of waterHow water is used: industry, energy and agricultureThe consequences of water insecurityCompeting users and trans-boundary riversThe players in water conflict, and its causesWater transfers as a hard engineering solutionMega dams and their costsDesalination, and the case against the techno-fixThe value of more sustainable schemes of restoration of water supplies and water conservationIntegrated drainage basin management and water treatiesThe players in water management and the conflicts between them
The Carbon Cycle and Energy Security
Topic overviewCarbon stores and fluxesChemical weathering, carbonate rocks and the slow carbon cycleBiological processes sequestering carbon (fast carbon cycle)Balanced carbon cycle sustaining earth systemsEnergy security and measuring energy useWhat shapes a country's energy mixContrasting energy mixes, public perception and OPECThe players in energy security, and energy pathwaysEnergy pathways and the mismatch between supply and demandUnconventional fossil fuels and their environmental costRenewables and nuclear: the costs and benefitsBiofuels, carbon capture, hydrogen and the uncertaintiesLand-use change and its effect on the carbon and water cyclesOcean acidification and coral reefsClimate belts, Amazonian drought and ecosystem servicesForest loss, the Kuznets curve and consumer attitudesHow warming changes the hydrological cycleUncertainty, ocean health and vulnerable regionsUncertainty, feedback loops and tipping pointsAdaptation and mitigation strategiesWhy players disagree, and handling climate data
Superpowers
Topic overviewWhat makes a superpower: economy, politics and militaryCultural, demographic and resource characteristicsHard power, soft power and smart powerThe Belt and Road Initiative, and power indexesPatterns of power change over timeEmerging powers and how their strengths are assessedWorld systems, dependency and modernisation theoryIGOs and how superpowers dominate themTNCs, cultural influence and WesternisationHow superpowers and emerging nations act in global decisionsAlliances, IGOs and geostrategyThe environmental cost of superpower demandThe rising middle class in emerging superpowersContested resources and intellectual propertyContested political spheres and open conflictChina's ties with the developing worldTensions in Asia and the Middle EastChallenges to existing superpowers, and future power structures
Health, Human Rights and InterventionConnections
Topic overviewConcepts of human developmentWhat causes variations in health and life expectancyHealth variations within countriesGovernments and IGOs defining development targets and policiesHuman rights in international law and agreementsDifferences between countries in definitions and protection of human rightsVariations in rights within countriesProgress towards equality, and the case studiesForms of geopolitical interventionDevelopment aid and the arguments about itEconomic development projects and military aidDevelopment focused on human rights and welfareHealth and life expectancy variation between and within countriesWelfare states, neo-liberalism and IGO programmesThe Responsibility to Protect and UN authorisationMilitary alliances, war crimes and the cost of military powerMeasuring the success of geopolitical interventionsThe mixed record of development aidWhy superpowers give aid, and the Gini coefficientMilitary interventions, both direct and indirect, have a mixed record of success
Migration, Identity and SovereigntyConnections
Topic overviewGlobalisation and the growth of migrationWhat changes migration patterns, and flow-line mapsVaried and complex causes of migrationConsequences of international migrationNation states and their varied historiesNationalism in the development of the modern worldTax havens, new state forms and alternatives to capitalismThe UN and its interventionsThe IMF, World Bank, WTO and other IGOsMigration in a globalised worldOpen borders, deregulation and migrant integrationNation states, borders and contested territoryNationalism, decolonisation and low-tax regimesIGOs managing environmental problemsNational identity as an elusive and contested conceptChallenges to national identityConsequences of disunity within nations
Regenerating Places
Measures of dispersion: range, interquartile range and standard deviation
- 3 things to know
- Paper 2
Overview
Dispersion diagrams and what a measure of dispersion shows, the range, interquartile range and standard deviation with a worked example on pebble lengths, and when standard deviation is more useful than the interquartile range.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Process
Eight pebble lengths (mm) are 2, 4, 4, 4, 5, 5, 7 and 9. What is the standard deviation?
Process
When is standard deviation more useful than the interquartile range?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a dispersion diagram?
Model answer
A graph in which each value in a dataset is plotted as a dot against a vertical scale, showing the spread and clustering of the data and making the median and quartiles easy to find.
- 2
What does a measure of dispersion show?
Model answer
How spread out the values in a dataset are around the average, which shows whether the average is typical of the data.
- 3
What is the range, and what is its main limitation?
Model answer
The difference between the highest and lowest values; it is easy to calculate but is distorted by a single extreme value.
- 4
What is the interquartile range, and why is it often better than the range?
Model answer
The difference between the upper quartile and the lower quartile, covering the middle 50% of the data, so it is not affected by extreme values.
- 5
What is standard deviation?
Model answer
A measure of the average spread of values around the mean, calculated as the square root of Σ(x − x̄)² ÷ n (some texts divide by n − 1 for a sample); a low value means the data are clustered closely around the mean.
- 6
Eight pebble lengths (mm) are 2, 4, 4, 4, 5, 5, 7 and 9. What are the range and the interquartile range?
Model answer
The range is 9 − 2 = 7 mm; the lower quartile is 4 and the upper quartile is 6 (the medians of each half of the data), so the interquartile range is 6 − 4 = 2 mm.
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