GCSE Geography Key Terms & Vocabulary

Abrasion (corrasion)

coastal erosion where waves hurl loose rock fragments against the cliff face, wearing it away.

Afforestation

the planting of trees in a drainage basin to intercept rainfall, increase evapotranspiration and reduce surface run-off into the river.

Attrition

coastal erosion where rock fragments carried by the sea collide and wear each other down, becoming smaller, smoother and more rounded.

Beach nourishment

a soft-engineering technique that adds imported sand or shingle to a beach to replace material lost to erosion.

Beach nourishment

classed as soft engineering because it works with natural processes — longshore drift continues to redistribute the added sediment.

Chalk

a relatively resistant, permeable rock: it erodes more slowly than clay or sand, so on the coast it stands out as headlands and steep white cliffs (Dover, the Seven Sisters). It is not the softer rock — students who call chalk soft lose the mark.

Confluence

the point at which two rivers meet and join.

Delta

a fan-shaped landform of deposited sediment that forms at a river's mouth where velocity falls sharply on entry to a still body of water.

Drumlin

a smooth, elongated egg-shaped hill of glacial till deposited and shaped beneath a moving glacier.

East Anglia

lowland — flat, low-lying land mostly below 200 m above sea level, including the fens.

Glacial erratic

a boulder transported by ice and deposited far from its place of origin; its rock type identifies the source area.

Flood relief channel

an artificial channel built parallel to a river that diverts excess discharge around a vulnerable settlement during high flow.

Floodplain

built by repeated overbank flooding that deposits fine alluvium (silt) on the valley floor, building up a flat, fertile plain.

Floodplain zoning

a soft-engineering strategy that restricts what can be built on flood-risk land (e.g. parks and car parks allowed, housing forbidden close to the channel).

Freeze-thaw weathering

the shattering of rock by water repeatedly freezing in cracks; the ~9 % volume expansion on freezing prises the rock apart.

Glacial abrasion

the grinding away of bedrock by rock fragments embedded in the base and sides of a moving glacier, producing striations and a polished surface.

Groyne

a low barrier built out into the sea (usually wood or rock) that traps sediment moving along the coast by longshore drift.

Scottish Highlands

the UK's highest range, containing Ben Nevis (1,345 m).

Hydraulic action

coastal erosion where waves compress air trapped in cracks in the cliff, and the release of pressure shatters the rock apart.

Lake District

the UK upland best known for U-shaped, glaciated valleys and ribbon lakes (Windermere, Ullswater).

Lake District

a national park in north-west England.

Load

the material carried by the river (suspended, bed, dissolved); discharge is the volume of water passing a point per second (m³/s, "cumecs") — they are different physical quantities.

Longshore drift

the movement of sediment along a coast by waves approaching the shore at an angle: swash carries sediment up the beach at the wave angle, backwash returns it straight down the slope.

UK lowlands

mostly located south and east of the Tees-Exe line.

Managed retreat

a soft-engineering strategy that deliberately allows low-value coastal land to flood, creating intertidal habitats such as salt marshes and dissipating wave energy.

Managed retreat

cheaper than hard engineering long-term, is more sustainable, and creates intertidal habitats (salt marshes, mudflats) that themselves dissipate wave energy.

Moraine

the general term for the rock debris carried, pushed and deposited by a glacier.

Ox-bow lake

a crescent-shaped lake formed when the neck of a meander narrows and the river cuts straight across, sealing off the abandoned loop with deposition.

Plucking

glacial erosion in which meltwater freezes onto bedrock, then the moving glacier rips rock fragments cleanly out of the valley floor or back wall.

Pyramidal peak (horn)

a sharp, pointed mountain summit where three or more corries have eroded back into the same mountain from different sides (the Matterhorn is the classic example).

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Climate change

difficult to manage effectively because it is a global problem needing international agreement, economies depend heavily on fossil fuels, mitigation is costly, and the benefits are long-term while the costs are immediate.

Carbon dioxide

the greenhouse gas most strongly associated with burning fossil fuels (coal, oil, natural gas).

Composite volcanoes

most commonly found at destructive plate boundaries, where subducting oceanic crust melts and rises as viscous magma.

Drought

an extended period of below-average rainfall that causes a shortage of water for people, agriculture or ecosystems.

Epicentre

the point on the Earth's surface directly above the focus.

Earthquake

not plates simply colliding: friction locks a fault, stress (elastic strain) builds up in the rock over years, and the earthquake is the sudden release of that stored pressure as the rock snaps and seismic waves radiate out.

Greenhouse effect

a natural process — without it Earth's mean surface temperature would be around −18 °C — but the enhanced greenhouse effect is driven by human activity.

Natural disaster

what happens when a natural hazard significantly harms people; the hazard is the event, the disaster is its realised impact.

Natural hazard

a natural event (geophysical, atmospheric, hydrological or biological) that poses a threat to people or property.

Oceanic crust

denser (~3.0 g/cm³) than continental crust (~2.7 g/cm³), which is why oceanic plates subduct beneath continental plates.

Plate motion

driven mainly by slab pull (a dense oceanic plate sinking at a subduction zone, dragging the rest of the plate behind it) and ridge push; mantle convection is a contributing force, not the sole cause. AQA examiners reward slab pull and ridge push, not "convection currents" alone.

Richter scale

logarithmic: each whole number step represents a tenfold increase in ground motion amplitude (and ~32× in energy release).

Hazard risk

highest when hazard severity, population exposure (number of people exposed) and vulnerability (capacity to cope) are all elevated.

Tropical storms

called hurricanes in the North Atlantic and Northeast Pacific, typhoons in the Northwest Pacific, and cyclones in the South Pacific and Indian Ocean.

Storm surge

sea level raised abnormally above the predicted tide by a tropical cyclone's low central pressure and strong onshore winds.

Supervolcano

characterised by a large caldera (a collapsed depression after a massive eruption) rather than a cone-shaped mountain.

Tectonic (geophysical) hazard

one caused by movement of Earth's crust — earthquakes, volcanic eruptions and tsunamis are the canonical examples.

Tropical storm

an atmospheric hazard — it originates in the lower atmosphere from warm-ocean evaporation, not from tectonic movement.

UK's weather

dominated by westerly Atlantic (Polar Maritime and Tropical Maritime) air masses, not the Arctic air from the north.

Exclusion zone

an area declared unsafe and evacuated around an active volcano during periods of heightened activity.

Atmospheric hazards include weather-driven events such as tropical storms, tornadoes and droughts.

Earthquake-resistant buildings can use reinforced frames and base isolators that absorb seismic energy and let the building move independently of the shaking ground.

Carbon capture and storage (CCS) traps CO₂ emitted by power stations and stores it underground in geological formations rather than releasing it to the atmosphere.

Climate change increases ocean heat content; warmer seas give tropical storms more energy and raise their average intensity.

Where two continental plates collide, neither subducts; the crust buckles upwards to form fold mountains such as the Himalayas.

Composite volcanoes produce explosive eruptions because their viscous lava traps gases, allowing pressure to build until a violent release.

A composite (stratovolcano) volcano has steep sides built from alternating layers of ash and lava; eruptions are typically explosive.

At a conservative (transform) boundary, two plates slide past one another; friction causes earthquakes but no subduction so no magma is generated and no volcanoes form.

At a constructive (divergent) plate boundary, two plates move apart and magma rises to form new crust, producing mid-ocean ridges and shield volcanoes.

Tropical storms do not form at the equator itself because the Coriolis effect needed to create rotation is effectively zero there.

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Active travel

walking and cycling for everyday journeys, replacing motorised trips and reducing emissions.

BedZED sustainable-development scheme

in London, in the London Borough of Sutton (Hackbridge).

Bristol Harbourside

a UK urban-regeneration example of redeveloped former dockland.

Brownfield site

previously developed land within an urban area, often vacant or derelict.

Counterurbanisation

the movement of people from cities to rural areas, often driven by quality-of-life motives such as cheaper housing or less congestion.

Counter-urbanisation

the movement of people from cities to rural or suburban areas.

Cycle lanes

part of urban sustainability because they encourage cycling over driving, cutting car use and tail-pipe emissions.

Deindustrialisation

the long-term decline of manufacturing in a region, leaving unemployment and derelict land in its wake.

Eco-cities

urban areas powered primarily by renewable energy and designed around low environmental impact.

Green belt

an area of land around a city in which new development is restricted, in order to prevent urban sprawl.

Greenfield sites

generally cheaper and quicker to build on than brownfield because no decontamination or demolition is needed, which makes them attractive to developers despite the loss of countryside.

Informal economy

unrecorded, untaxed economic activity such as street trading and casual work.

Integrated transport system

one in which different modes (bus, train, tram, cycle) connect so journeys can flow between them.

London Docklands

the standard UK example of large-scale urban regeneration of former port land.

Megacity

a metropolitan area with a population of over 10 million people.

Megacity

a city with a population of over 10 million people; the share of megacities located in LICs and NEEs has grown rapidly since the 1980s.

Re-urbanisation

the movement of people back into city centres, often following regeneration of previously run-down inner urban areas.

Rio de Janeiro

located in Brazil.

Rio de Janeiro

in Brazil, a Newly Emerging Economy (NEE).

Rocinha

the name of Rio de Janeiro's largest favela.

Squatter settlements

common around LIC/NEE megacities because rural-urban migration outpaces formal housing supply, so migrants build informal homes themselves.

Suburbanisation

the growth of housing on the edge of existing cities, expanding the urban area outward into the rural-urban fringe.

Tokyo (Greater Tokyo Area)

currently the world's largest city by population, at approximately 37 million.

Urban heat-island effect

how buildings and roads absorb and store heat, making cities warmer than surrounding rural areas.

Urban primacy

the situation where one city dominates a country's economy and population (often more than twice the next-largest city).

Urban regeneration

investment in derelict urban areas to improve them economically and physically.

Urbanisation

an increase in the proportion of a country's population living in urban areas.

Urbanisation

currently happening fastest in LICs and NEEs (especially in Africa and Asia), not in HICs such as the UK and USA where urban populations are already stable.

BedZED (Beddington Zero Energy Development) is a sustainable London housing scheme completed in 2002 that uses solar panels and high-performance insulation.

Brownfield development reuses already-developed land instead of consuming greenfield space, conserving countryside and ecosystems.

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Birth rate

the number of live births per 1,000 people in a population per year.

Debt relief

the cancellation of some or all of a poor country's foreign debt, freeing money for health, education and infrastructure.

De-industrialisation

the long-term decline of manufacturing employment, often causing unemployment and physical decay in former industrial areas.

Demographic Transition Model

a five-stage model linking birth and death rates to a country's economic development.

Fair trade

a scheme giving producers in LICs a guaranteed minimum price and fair working conditions.

Fair trade

considered a development tool because it guarantees fair prices for producers, not lower prices for buyers.

GNI per capita

the average income per person in a country (gross national income divided by population).

Infant mortality

the number of deaths of children under one year old per 1,000 live births per year.

Intermediate technology

about affordable tools matched to local skills — not high-tech robots or expensive imported equipment.

Intermediate technology

tools that are simple, affordable, locally repairable, and matched to local skills.

Lagos

Nigeria's largest city and a major commercial hub for West Africa.

Literacy rate

the percentage of adults who can read and write.

Microfinance

the lending of small sums of money to people in LICs to start a small business; borrowers often cannot access traditional bank loans.

Multilateral aid

provided by international agencies such as the World Bank or IMF, rather than by a single country.

Natural increase

the birth rate minus the death rate, giving the change in population per 1,000 people per year from births and deaths alone (a birth rate of 40 and death rate of 15 per 1,000 give a natural increase of 25 per 1,000).

Nigeria

located in West Africa, on the African continent.

Nigeria

classified as a newly emerging economy (NEE), not a low-income country (LIC).

Oil

Nigeria's dominant export commodity.

Post-industrial economy

one dominated by services and knowledge work rather than manufacturing — the term used to describe the modern UK economy.

Quaternary sector

the knowledge-based part of the economy: research, information technology, and consultancy services.

Science park

a business area located close to a university, providing companies with research links and access to skilled graduates.

Service sector

the sector that grew during the UK's post-industrial shift, while coal, steel and textiles contracted.

Tourism

a powerful development strategy for some LICs because it brings foreign currency and creates jobs across multiple sectors.

Foreign aid does not always benefit recipients equally — outcomes depend on governance, corruption, conditions attached, and whether aid is tied to donor goods/services.

The City of London — the "Square Mile" — is the UK's historic financial district and remains its main financial centre.

Rural areas near major UK cities have benefited economically from commuter spending and counter-urbanisation.

Debt relief writes off poor countries' loans, freeing money that would have serviced debt for development spending.

During rapid economic growth LICs typically experience declining birth and death rates as healthcare, education and employment improve.

The model that shows how birth and death rates change as a country develops is the Demographic Transition Model.

In Stage 2 of the Demographic Transition Model the death rate falls (improved healthcare, sanitation, food) but the birth rate stays high — causing rapid population growth.

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Bar chart

most appropriate for comparing discrete categories or groups.

Cross-section

a diagram showing the height of the land (a side-view profile) between two points on a map.

Evaluating an enquiry

identifying limitations in the data collection and suggesting improvements for future investigations.

Line graph

most appropriate for showing change over time using continuous data.

Mean

calculated by adding all the values together and dividing by the number of values.

Median

the middle value of a dataset when the values are arranged in order.

Mode

the value that occurs most frequently in a dataset.

Null hypothesis

a statement predicting that there is no relationship between the variables being investigated.

Physical-geography feature

a natural one (river, hill, valley, coast, forest); a human-geography feature is one people made (road, factory, railway, settlement). A road on a map is human, not physical geography.

Pie chart

best for showing data as proportions of a whole (adding to 100%).

Primary data

first-hand data that the researcher collects themselves in the field.

Quadrat

a square frame used to count species or measure ground coverage within a defined area, typically in vegetation surveys.

Qualitative data

descriptive data based on opinions, observations or feelings rather than numbers.

Quantitative data

numerical data that can be measured and counted (e.g. river velocity, pedestrian counts).

Range

calculated by subtracting the lowest value from the highest value.

Secondary data

data collected by someone else (e.g. census figures, textbooks, online databases) rather than by the fieldworker.

Stratified sampling

chosen when sub-groups must be represented in proportion to their size in the whole population.

Systematic sampling

preferred when even coverage matters (e.g. along a river channel) because it spreads data points evenly along the feature.

Transect

a line along which measurements are taken at regular, fixed intervals, used to record change across an area.

Triangular graph

used when data has three components that add up to 100%.

On a 1:50,000 OS (Landranger) map, A roads are shown in red.

To "adapt" a data-collection method means to improve or change how the existing method is carried out (e.g. measure at more sites, repeat readings); it does not mean adding a brand-new, additional method — an AO4 distinction examiners test directly.

An anomaly (outlier) on a scatter graph is a point that does not fit the overall trend.

A choropleth map uses shading or colour proportional to data values to show how a variable varies across areas.

Closely spaced contour lines indicate a steep slope.

Concentric circular contour lines indicate a hill or mountain summit.

On a standard 1:25,000 OS map the contour interval is 5 metres.

A contour line on an OS map joins points of equal height above sea level.

To "describe a distribution or pattern" you state the overall trend (where most of it is, using compass directions), then pick out any anomalies, and support both with figures from the resource — not a list of every value.

When reading a grid reference you read the eastings first (along the bottom) and then the northings (up the side).

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Arctic tundra

fragile because it has a short growing season and recovers slowly from any damage.

Biome

a large-scale global ecosystem defined by its climate and characteristic vegetation.

Climate

the biggest factor in determining which biome exists in a given region.

Cold environments

considered fragile ecosystems because they recover slowly from disturbance — a consequence of short growing seasons and cold-limited biological activity.

Cold-environment plants

typically low-growing, have shallow roots, and complete a short life cycle within the brief summer.

Consumer

an organism that gets its energy by eating other organisms rather than making its own food.

Debt-for-nature swap

an agreement in which a country's external debt is cancelled (or reduced) in exchange for binding commitments to conserve part of its rainforest.

Decomposer

an organism that breaks down dead organic matter into simpler substances, recycling nutrients into the soil.

Deforestation

the removal of trees from a forested area at a rate faster than the forest can regrow.

Desertification

the process by which fertile land at the desert's edge degrades and becomes desert-like, driven by climate change and human activity.

Ecosystem

a community of living things together with their physical environment, interacting as a system.

Ecotourism

a sustainable management strategy that generates income for local communities while conserving rainforest ecosystems.

Leaching

the process by which heavy rainfall washes soluble nutrients down through soil, removing them from the reach of plant roots.

Establishing protected national parks

one strategy for managing cold environments sustainably, by limiting damaging activities.

Nutrient cycle

how nutrients move between living organisms and the physical environment.

Permafrost

ground that remains frozen throughout the year, found in cold environments such as tundra.

Permafrost

permanently frozen ground in cold environments.

Polar bears

adapted to the tundra with thick fur and a layer of blubber for insulation, plus small ears to limit heat loss.

Producer

an organism that makes its own food through photosynthesis.

Canopy

the dense, continuous layer of treetops that forms a near-unbroken roof over the rainforest and captures most of the sunlight.

Emergent layer

the tallest layer of a tropical rainforest, where the tallest trees protrude above the main canopy.

Tropical rainforest soils

generally thin and nutrient-poor (not deep and rich), because rapid plant uptake and leaching strip nutrients from the soil.

Understory

the shadier layer of smaller trees and shrubs that grows below the rainforest canopy.

Selective logging

considered sustainable because only mature trees are felled while younger trees and forest structure remain, allowing the forest to recover.

Tundra

the name for the treeless, frozen plain found in Arctic (and high-altitude) regions.

Afforestation (planting trees) reduces desertification by binding soil with roots and acting as windbreaks, lowering erosion rates.

AQA GCSE Geography uses the Thar Desert (north-west India / south-east Pakistan) as its hot-desert case study.

Visible effects of climate change on the Arctic include shrinking sea ice and thawing permafrost.

Tropical rainforests and hot deserts are both examples of biomes.

The biotic components of an ecosystem are its living parts — plants, animals, fungi and bacteria.

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Agroforestry

the practice of growing crops and trees together on the same land to improve soil quality, biodiversity and long-term sustainability.

Climate change

increasing food insecurity in many LICs by making rainfall patterns more unpredictable, raising drought frequency and shifting growing seasons.

Contaminated water

a major health risk in LICs because diseases like cholera spread rapidly when people drink sewage-contaminated water.

Desalination

the process of removing salt from seawater to produce fresh water suitable for drinking or irrigation.

Desalination

expensive and energy intensive, so it is not an inexpensive or widely accessible solution to water insecurity in LICs.

Energy consumption per capita

the term for daily energy use averaged across a country's population.

Energy security

reliable access to sufficient and affordable energy supplies for a country's needs.

Energy security

reliable access to affordable, sustainable energy supplies.

Famine

a severe and widespread food shortage that causes mass starvation, malnutrition and excess mortality.

Food security

reliable access to sufficient, safe and nutritious food to meet people's dietary needs.

Food security

reliable access to safe and nutritious food in sufficient quantities to meet dietary needs.

Fracking

controversial because of risks to groundwater quality and the potential to trigger small earthquakes (induced seismicity), as well as methane leaks.

Greywater

household waste water from baths, sinks and washing machines that can be reused for non-drinking purposes such as irrigation or toilet flushing.

Natural gas

a non-renewable fossil fuel formed over millions of years; wind, solar and hydro are renewable.

Permaculture

a sustainable food-production approach that designs farms to mimic natural ecosystems, reducing inputs and increasing resilience.

Renewable energy sources

low-carbon in operation but still produce some greenhouse gases during manufacture, installation and decommissioning — they are not zero-emission over their whole life cycle.

Global resource demand

rising because of population growth and rising consumption per person, not because resources are becoming harder to extract.

Sustainable food supply

production that meets present demand without compromising the ability of future generations to meet theirs — combining yields with environmental stewardship.

Water insecurity

the lack of reliable access to safe and sufficient water for daily needs.

Water stress

the condition where demand for water exceeds the available supply in a region.

Aeroponics grows plants with their roots suspended in the air, sprayed with a misted nutrient solution, with no soil required.

Climate change can reduce crop yields (through drought, heat stress and pest range shifts) and so reduce food security at both the household and national scale.

Burning coal releases the most CO₂ per unit of energy of any common fossil fuel — more than oil, and roughly twice that of natural gas.

Desalination converts seawater into fresh water by reverse osmosis or thermal distillation.

Energy insecurity can drive political tension between countries that depend on imported fossil fuels and the producer states they buy from.

Food miles measure the distance food travels from producer to consumer; long food miles typically correlate with higher transport emissions.

A country achieves food security when it has reliable access to enough affordable and safe food for all its people.

Reducing household food waste improves food security because less food has to be produced to feed the same population.

Fracking (hydraulic fracturing) injects high-pressure water, sand and chemicals into shale rock to fracture it and release trapped natural gas.

Global demand for resources is increasing because of population growth and rising consumption per person in NEEs such as China and India.

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