KS3 Geography Key Terms & Vocabulary

Wind speed

measured using an anemometer.

Air pressure

measured using a barometer.

Biomes

large ecological zones determined mainly by temperature and precipitation patterns.

Climate

typically calculated using at least 30 years of averaged weather data to identify a statistically meaningful average.

Climate

calculated as an average over a long period — the World Meteorological Organization uses 30 years as the standard.

Polar climate zone

found in the regions near the North and South Poles.

Rainfall

measured using a rain gauge.

Rain gauge

the standard instrument for measuring rainfall (liquid precipitation) over a set time interval.

Relief rainfall

rainfall caused by air being forced to rise over mountains, cooling and condensing into clouds.

Equatorial regions

hot because the Sun is nearly overhead year-round, delivering intense, direct solar radiation.

Tropical climate zone

found around the equator (roughly between the Tropic of Cancer and the Tropic of Capricorn).

Weather

short-term; climate is a long-term average of weather patterns.

Weather

what you experience on any given day; climate is the long-term atmospheric pattern of a place.

Weather

the day-to-day state of the atmosphere (temperature, rainfall, wind on a given day); climate is the long-term average of weather over many years.

Western UK

wetter than the east because westerly Atlantic winds are forced to rise over the western hills and mountains, cool, and deposit relief (orographic) rainfall.

Altitude affects climate: temperature drops as elevation rises (about 6.5°C per kilometre on average).

Climate and weather are not the same thing; weather describes short-term atmospheric conditions while climate describes long-term averages.

The Gulf Stream and its North Atlantic Drift extension keep the UK warmer in winter than other countries at the same latitude.

Climate zones depend mainly on latitude — the distance from the equator.

A maximum-minimum thermometer (Six's thermometer) records the highest and lowest temperatures reached in a 24-hour period.

The Mediterranean climate zone has hot, dry summers and mild, wet winters, and is found around the Mediterranean Sea (plus parts of California, Chile, the Cape, and SW Australia).

The Mediterranean zone has hot dry summers and mild wet winters.

The UK has mild winters compared with other locations at the same latitude because of the warm North Atlantic Drift current.

The North Atlantic Drift brings warm water from the Gulf of Mexico to the west coast of the UK, moderating its winter climate.

The polar / sub-polar zone has very cold winters and short, cool summers.

Polar climate zones lie at the highest latitudes, near the North and South Poles.

Prevailing south-westerly winds bring moist Atlantic air to western Britain, which is why the west is wetter than the east.

The seas surrounding the UK moderate temperatures, giving the UK a relatively narrow annual temperature range.

Areas near the equator have a tropical (also called equatorial) climate.

The UK's prevailing winds come from the south-west.

Showing 30 of 36. Practise the full Weather and Climate set →

Grid references

read with the easting (along the corridor) before the northing (up the stairs).

Map key (legend)

a panel on the map that explains what each symbol and colour represents.

Map scale

the ratio between distance on the map and the corresponding distance on the ground.

Six-figure grid reference

more accurate than a four-figure reference because it pinpoints a 100 m square rather than a 1 km square.

A scale of 1:25,000 means 1 cm on the map equals 25,000 cm (250 m) on the ground.

On a 1:25,000 map, 1 cm on the map represents 25,000 cm (250 m) on the ground.

On a 1:50,000 map, 1 km on the ground is represented by 2 cm on the map.

On an OS map, a thin dashed blue line usually represents a small stream or seasonal water course.

Moving clockwise from north, the four cardinal compass points are North, East, South, West.

Contour lines drawn close together indicate a steep slope.

A magnetic compass needle aligns with Earth's magnetic field, so it points toward magnetic north.

A standard compass rose has eight points: four cardinal (N, E, S, W) and four ordinal/intercardinal (NE, SE, SW, NW).

The vertical height difference between consecutive contour lines is called the contour interval.

A contour line joins points of equal height above sea level — usually shown in brown at fixed intervals (e.g. every 10 m).

Contour lines on a map join points of equal height above sea level.

Contour lines on a map show height above sea level (elevation).

On a compass, east is the direction opposite to west.

A four-figure grid reference identifies a whole square, not a single point.

A four-figure grid reference identifies a 1 km grid square; a six-figure grid reference pinpoints a 100 m square within it.

A hill summit on an OS map is shown as concentric closed contour lines, with the highest value at the centre.

A larger map scale (e.g. 1:25,000 compared to 1:50,000) shows more detail but covers a smaller area.

The intercardinal direction between north and east on a compass is north-east (NE).

On the OS National Grid, northings are the horizontal grid lines numbered going up the map.

On an OS map, blue lines usually represent rivers (water features).

On an OS map, blue is used for water features (rivers, lakes, streams); roads are coloured red, brown, orange or yellow depending on classification — never blue.

On OS Explorer 1:25,000 maps the standard contour interval is 5 metres in lowland areas.

The shape and vertical variation of the land surface is called relief.

A six-figure grid reference contains six digits — three for the easting and three for the northing.

On a compass, south-west is the direction opposite to north-east.

When contour lines are close together the slope is steep; widely spaced contours mean gentle ground or a plateau.

Showing 30 of 32. Practise the full Map Skills set →

Confluence

where two rivers meet — it is not where a river meets the sea (that point is called the mouth).

Confluence

the location where two rivers (or streams) meet.

Delta

a fan-shaped landform of sediment deposited where a river meets the sea or a lake.

Deposition

the dropping of sediment by a river as it loses energy and can no longer carry its load.

Drainage basin

the area of land drained by a river and all its tributaries.

Erosion

greatest in the upper course where the river is fastest and the gradient is steepest.

Erosion

the wearing away of a river's bed and banks by the flowing water and the sediment it carries.

Floodplain

the flat land alongside a river that is periodically flooded.

Meanders

typically found in the middle course of a river, where gradient is gentle and lateral erosion dominates.

Tributary

a smaller river or stream that flows into a larger river.

Tributary

a smaller river joining a larger one — not the start of the river, the boundary of the basin, or a feature at the mouth.

Watershed (drainage divide)

a ridge of high land forming the boundary between two drainage basins.

Abrasion in a river is the scraping action of rocks and sediment along the riverbed and banks.

A delta forms at a river's mouth as it enters a sea or lake and loses energy.

Most deposition in a river happens when the water slows down (loses energy).

When a river drops the material it is carrying, the process is called deposition.

Rivers deposit sediment when their velocity decreases, not increases; faster flow keeps material in transport.

Rivers transport material in four ways: traction, saltation, suspension and solution.

A river deposits the most material in its lower course, where the flow slows down.

Meanders form in the middle course of a river because erosion on the outer bank and deposition on the inner bank exaggerate bends over time.

The mouth of a river is where it meets the sea or a lake.

An oxbow lake forms when a meander is cut off from the main river channel.

When a meander is cut off, the abandoned loop forms a lake called an oxbow lake.

Solution as a river process is when soluble rock (such as limestone or chalk) dissolves into the water.

The source of a river is the point where it begins — typically in springs, lakes or melting ice at high elevation.

The process by which a river carries its load (in any mode) is called transportation.

A river has the most potential energy in its upper course, where the gradient is steepest; its average velocity actually increases downstream as friction falls.

In its upper course, a river carves a V-shaped valley with steep sides through vertical erosion.

Waterfalls form where a band of hard, resistant rock overlies softer rock that gets undercut.

The boundary between two drainage basins is called a watershed.

Showing 30 of 31. Practise the full Rivers set →

Biome

a large global zone defined by its climate, vegetation and wildlife.

Biomes

large-scale ecosystems shaped mainly by climate (temperature and rainfall).

Tropical rainforest

the biome with high rainfall and high temperatures all year round.

Tropical rainforest

the dense forest biome found near the equator, with consistently warm temperatures and very high rainfall.

Savanna

the biome with tropical grasslands and scattered acacia trees.

Boreal forest (taiga)

the biome that covers most of northern Russia and Canada.

Tundra

the biome found near the Arctic Circle with very cold winters and a short summer growing season.

Tundra

the biome characterised by frozen ground (permafrost) and treeless landscapes, found in the Arctic.

Carnivore

an animal that eats other animals.

Consumer

an organism that obtains its energy by feeding on plants or other animals, rather than producing its own food.

Decomposer

an organism (such as bacteria or fungi) that breaks down dead organic matter into simpler substances, recycling nutrients back into the ecosystem.

Decomposers

the organisms (e.g. bacteria, fungi) that break down dead material in an ecosystem, releasing nutrients back into the soil.

Herbivore

an animal that eats only plants.

Producer

an organism that makes its own food using sunlight (through photosynthesis); producers form the base of every food chain.

Climate — mainly temperature and rainfall — is the primary factor that determines which biome develops in a given area.

Hot deserts receive less than 250 mm of rainfall per year.

The tropical rainforest biome receives over 2,000 mm of rainfall per year.

The savanna biome covers large areas of East and Southern Africa, South America and northern Australia, with grassland and scattered trees.

The arrows in a food chain show the direction in which energy flows — from the organism being eaten to the organism eating it.

A food chain shows the transfer of energy from producers to consumers through successive feeding steps.

The first organism in any food chain is a producer (e.g. grass, algae), because producers make the food energy that everything else depends on.

Removing one species from a food web can affect many others, because the species fits into many feeding pathways at once.

A food web shows many interconnected feeding pathways through an ecosystem — not just a single chain — because most organisms eat (and are eaten by) more than one species.

Global development inequalities

caused by a combination of historical factors — colonialism, geography, trade patterns and conflict — rather than by any single cause such as climate or work ethic.

Development gap

the difference in wealth and quality of life between richer and poorer countries.

GNI per capita

a limited measure because it is an average, so it hides unequal income distribution within a country (a few very rich people can pull the average up).

Human Development Index

the named indicator that combines income, education and life expectancy into a single value between 0 and 1.

Infant mortality

measured as deaths of infants under one year of age per 1,000 live births in a year.

Life expectancy

the average number of years a person in a country can expect to live, based on current age-specific mortality rates.

An emerging country (also called a newly industrialising country, NIC) is one with developing industry and rising incomes — for example India, Brazil or China.

GDP stands for Gross Domestic Product — the total monetary value of goods and services produced within a country in a given period.

Most of the world's poorer countries are located in the global south (e.g. sub-Saharan Africa, parts of South Asia, Central America), while most richer countries are in the global north — the so-called North–South divide.

One feature of a more developed country (HIC) is a high life expectancy, alongside lower infant mortality, higher literacy and higher GDP per capita.

HIC stands for High-Income Country — a country classified by the World Bank as having a high gross national income per capita.

LIC stands for Low-Income Country — a country classified by the World Bank as having a low gross national income per capita.

Life expectancy in low-income countries is generally lower than in high-income countries because of reduced access to clean water, healthcare and nutritious food.

Not every African country is a LIC — countries such as South Africa, Botswana and Mauritius are classified as middle- or higher-income economies.

GDP per person on its own is an imperfect measure because, as an average, it hides inequality within a country.

GNI stands for Gross National Income — the total income earned by a country's residents from both domestic and foreign sources.

The HDI combines three dimensions: income (GNI per capita), education (mean and expected years of schooling) and life expectancy.

HDI stands for Human Development Index — a composite measure produced by the UN that ranks countries by development level.

A high infant mortality rate is typical of less developed countries; HICs have very low infant mortality, so a high rate signals lower, not higher, development.

Literacy rate measures the percentage of the adult population (usually aged 15 and over) who can read and write.

Mean years of schooling is the indicator that measures the average number of years of education received by people aged 25 and over; it is one of the education components of the HDI.

Combining several indicators (income, health, education) gives a more accurate picture of development than relying on a single indicator such as GDP per capita alone.

Deforestation

the large-scale removal of trees from a forested area, usually to make room for other land uses.

Greenhouse effect

the trapping of heat in Earth's atmosphere by gases such as carbon dioxide, methane and water vapour, which absorb and re-emit infrared radiation.

Greenhouse effect

a natural process essential for life; human activity has enhanced it rather than created it.

Reforestation

the planting of new trees to replace forest that has been cleared.

Climate change

causing global sea levels to rise through melting of land ice (glaciers and ice sheets) and thermal expansion of warming seawater.

Tropical forests

cleared primarily for logging, farming (crops and ranching), and road and infrastructure building.

Brazil contains the largest area of tropical rainforest of any Amazon-basin country.

Brazil has the highest area of tropical rainforest deforestation, driven mainly by clearance in the Amazon.

Burning fossil fuels (for electricity, transport and industry) is the largest human source of CO₂ emissions into the atmosphere.

Carbon dioxide released by burning fossil fuels is the principal gas driving recent human-made climate change.

Trees absorb CO₂ as they grow; removing them both releases stored carbon and reduces future CO₂ absorption, increasing atmospheric greenhouse gases.

Removing trees reduces interception and soil cohesion, so rainfall reaches rivers faster and the risk of flooding increases.

Deforestation destroys habitats, reducing biodiversity, and simultaneously adds CO₂ to the atmosphere.

Coal, oil and natural gas are fossil fuels that contain carbon stored from organisms that lived millions of years ago; burning them releases that carbon as CO₂.

The leading cause of tropical deforestation is clearing land for agriculture, particularly cattle ranching and soy cultivation.

Over millennia, Earth's climate has been affected by natural factors including variations in Earth's orbit (Milankovitch cycles) and changes in solar output.

The 2015 Paris Agreement aims to limit global warming to well below 2 °C, and ideally to 1.5 °C, above pre-industrial levels.

Creating national parks and legally protected areas where logging is banned is a recognised strategy for reducing deforestation.

Switching electricity generation from fossil fuels to renewable sources such as wind, solar and hydro reduces greenhouse gas emissions.

Selective logging (removing chosen mature trees rather than clear-felling whole areas) is a sustainable forestry strategy that helps reduce overall forest loss.

Trees and other plants absorb CO₂ from the atmosphere during photosynthesis, so planting more trees (afforestation) can help reduce atmospheric CO₂.

Trees store carbon in their wood and leaves; when forests are burned or rot, that carbon is released to the atmosphere as CO₂.

Ageing population

the share of older people is rising relative to younger people.

Birth rate

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

Death rate

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

Population density

the number of people living per square kilometre.

Population density

measured in people per square kilometre (people per km²).

Fertility rate

the average number of children born per woman over her lifetime.

India

the most populous country in the world today, having overtaken China in 2023.

Migration

the movement of people from one place to another to live permanently or semi-permanently.

Natural increase

the birth rate minus the death rate of a population.

Push factor

a negative condition that drives people away from an area, such as war, persecution or unemployment.

Population

unevenly distributed across the Earth's surface, with large concentrations in some regions and near-empty areas in others.

Reliable water, fertile soil and a mild climate make an area attractive to settlement.

Most of the world's largest cities are located near coasts or rivers because water enabled trade, fishing and transport long before modern road networks.

A country with very low birth and death rates and little natural change is described as demographically stable.

An area with many people per square kilometre is described as densely populated.

Flat, fertile river valleys are typical examples of densely populated areas because they offer water, productive soil and easy movement.

Hot desert regions have very low population density because of extreme heat, lack of water and poor soils.

A country's population decreases by natural change when its death rate is higher than its birth rate.

Pull factors attract migrants to a destination; better job opportunities and higher wages are textbook examples.

Areas with very few people per square kilometre are described as sparsely populated.

Places near reliable water supplies and good fertile soil tend to be densely populated.

World population has grown rapidly since 1900 mainly because death rates fell due to better medicine, sanitation and food supply, not because birth rates rose.

Africa

projected to see the fastest urban population growth over the next 30 years.

Traffic congestion

the build-up of vehicles on a road such that traffic moves slowly or comes to a standstill.

Informal settlement

an area of self-built housing constructed without planning permission on land the occupants typically do not own.

Megacity

a city with a population of more than 10 million people.

Pull factors

conditions at a destination that attract migrants, such as jobs and better services.

Rural-urban migration

the movement of people from rural areas to cities, usually to access work and services.

Smog

air pollution caused by emissions from traffic and factories reacting in the atmosphere; the name comes from a blend of "smoke" and "fog".

Squatter settlement

unplanned housing built on unused or unclaimed land by people without legal tenure.

Informal settlements

also called squatter settlements or shanty towns; "favela" (Brazil) and "slum" are related terms.

Suburbanisation

the gradual movement of people from city centres to surrounding suburbs.

Urbanisation

both the physical growth of cities and the movement of people from rural to urban areas.

Urbanisation

the increase in the proportion of people living in urban areas relative to rural areas.

Urbanisation

happening fastest in low-income countries (LICs) and middle-income countries; the UK and other HICs urbanised long ago.

Rapid urban growth causes congestion because road capacity and public transport investment lag behind rising car ownership and population.

Informal settlements in LIC cities generally lack reliable clean water, sanitation, and waste collection.

The majority of the world's largest cities (megacities) are now in developing countries.

Fast-growing megacities typically experience housing shortages alongside expanding unplanned settlements on the urban fringe.

Investing in public transport reduces both road traffic and the vehicle exhaust that drives urban air pollution.

Typical urban pull factors include better-paid jobs, schools, healthcare, and entertainment.

Typical rural push factors include drought, crop failure, lack of jobs, and conflict.

The central challenge of rapid urbanisation in LICs is that housing, transport, water, sanitation, and electricity infrastructure cannot be built fast enough to keep pace with population growth.

Rapid urban growth commonly produces shortages of affordable housing, clean water, and formal jobs.

Stack

formed when the roof of a coastal arch becomes unsupported and collapses, leaving an isolated column of rock.

Bay

the landform produced by erosion of softer rock between two headlands of harder rock.

Headland

a narrow promontory of hard, resistant rock that juts out into the sea, formed where the softer rock around it has been eroded faster.

Spit

a long, narrow ridge of sand or shingle that extends from the coast out into the sea, built up by longshore drift depositing material.

Wave-cut platform

a gently sloping rocky shelf left at the base of a cliff after waves erode a notch at the high-tide line and the overhanging cliff collapses back.

Attrition

the erosion process in which rocks and pebbles knock against each other in the waves, becoming smaller, smoother and rounder over time.

Deposition

the laying down of material that was being carried by the sea, occurring when waves no longer have enough energy to keep transporting it.

Hydraulic action

the erosion process in which waves force water and compressed air into cracks in coastal rock, causing it to fracture and break apart.

Longshore drift

the transport process that moves sediment along a coastline as waves hit the shore at an angle.

Destructive waves erode the coast (tall, frequent, strong backwash); constructive waves build it up (long, low, strong swash).

Bays form where softer, less resistant rock is eroded back faster than the surrounding harder rock, leaving a curved inlet between two headlands.

When a cave on a headland is enlarged by continued wave erosion, it cuts right through the headland to form an arch.

Headlands and bays form along the same coast when bands of hard and soft rock lie perpendicular to the shore; the softer rock erodes faster, producing alternating headlands and bays.

The classic headland erosion sequence runs crack → cave → arch → stack → stump, as wave erosion progressively cuts through the rock until an isolated pillar (stack) is left and finally reduced to a stump at sea level.

A sand or shingle ridge that grows across the mouth of a bay (often partially closing it off) is also called a spit; the enclosed water behind it may become a salt marsh or lagoon.

Stacks form when waves erode a crack in a headland into a cave, the cave is enlarged into an arch, and the arch eventually collapses, leaving an isolated pillar of rock standing in the sea.

Longshore drift is the movement of sand and pebbles along the coast, driven by waves arriving at an angle and the backwash pulling material straight back.

Constructive waves have a strong swash and weaker backwash, building up the beach by deposition; destructive waves have a stronger backwash than swash and remove material, eroding the beach.

Coastal deposition occurs when waves lose energy (in sheltered bays or where they slow down), causing them to drop the sediment they were carrying.

Hard engineering uses artificial structures such as sea walls, groynes and rock armour to defend the coast, while soft engineering works with natural processes (beach nourishment, dune regeneration, managed retreat).

Waves approaching the coast at an angle push sediment diagonally up the beach (swash) and pull it straight back down (backwash), producing the zigzag movement of longshore drift along the coast.

Drought

defined by a sustained shortfall in precipitation relative to the local average — it is about water deficit, not high temperature alone.

Drought

a prolonged period of below-average rainfall that leads to water shortages.

Earthquakes

caused by sudden movement at or near tectonic plate boundaries, which releases stored energy as seismic waves.

Epicentre

the point on Earth's surface directly above the focus (hypocentre) of an earthquake.

Flood

the overflow of water that submerges land which is normally dry, typically after heavy rainfall, snowmelt or a storm surge.

Natural hazard

a natural process or event with the potential to cause harm; it becomes a natural disaster only when it significantly harms people, property or economies.

Lava

the molten rock that erupts from a volcano onto the surface (it is called magma while still inside the Earth).

Seismometer

the instrument used to detect and record the ground motion caused by earthquakes.

Tectonic plate

a large section of Earth's crust and upper mantle (the lithosphere) that moves slowly relative to other plates.

Volcano

an opening in Earth's crust through which magma, ash and gases escape onto the surface.

The focus (hypocentre) of an earthquake is the point inside Earth where the rupture begins and energy is first released.

A tropical storm in the North Atlantic (and the North-East Pacific) is called a hurricane.

A tropical storm in the North-West Pacific is called a typhoon.

Most, but not all, earthquakes and volcanoes occur at plate boundaries; some occur within plates (intraplate earthquakes and hotspot volcanoes such as Hawaii).

Most of the world's earthquakes and volcanoes occur along the Pacific Ring of Fire — a horseshoe-shaped belt of plate boundaries around the Pacific Ocean.

Earthquakes and volcanoes frequently occur in the same regions because both are produced by tectonic plate movement at plate boundaries.

The calm, low-pressure centre of a tropical storm is called the eye.

Tropical storms form most commonly between roughly 5° and 30° latitude, where the sea is warm enough (≥27 °C) and the Coriolis effect from Earth's rotation is strong enough to start the system rotating.

The main hazards of a tropical storm are strong winds and storm surge, alongside torrential rainfall and flooding.

Tropical storms (tropical cyclones) form over warm ocean water with sea-surface temperatures of at least about 27 °C.