HL Paper 1 & the key concepts

The seven options are the same as SL; HL simply requires three and more extended, evaluative writing. Argue every theme through the four key concepts:

• Places — distinctive, named, located.
• Processes — the physical/human mechanisms, in detail.
• Power — who controls decisions, flows and access.
• Possibilities — futures, management and sustainability.

Scale: the strongest HL answers deliberately shift between local, national, regional and global — and reach a justified conclusion.

Freshwater — discharge & the Bradshaw model

Down a drainage basin, the Bradshaw model predicts velocity, discharge and channel size increase downstream while bed roughness and gradient fall. River discharge (Q) is:

A short lag time and high peak on a storm hydrograph point to steep, impermeable or urbanised basins — the physical processes that raise flood risk.

Possibilities & power: hard engineering vs catchment-based "slow the flow" schemes — who gains protection and who bears the cost is a question of power.

Your turn — river discharge

What is discharge?

Oceans & coastal margins — sediment budgets

Coasts behave as sediment cells: a stretch of coast where inputs, transfers and outputs of sediment are broadly self-contained. The net change is a sediment budget:

Oceans also store heat and carbon and move it via currents; reefs and mangroves are highly productive "blue carbon" stores but are vulnerable to warming and acidification.

Power: the open ocean is a global commons — overfishing and plastic pollution are governance problems no single state controls.

Your turn — sediment budget

Extreme environments — productivity

Hot arid and cold/high-altitude environments have low biological productivity. We measure this with net primary productivity (NPP) — the energy plants fix minus what they respire:

Low NPP means fragile food webs and slow recovery from disturbance, which shapes both natural systems and human possibilities (nomadic pastoralism, careful land management).

Global links: permafrost thaw and desertification connect this option directly to the Global Change core.

Your turn — net primary productivity

Which family of themes?

Tap a term, then tap the theme family it belongs to.

Geophysical hazards & risk

Earthquakes, volcanoes and mass movements become disasters only when they meet vulnerable people. The IB frames this as:

HL depth includes prediction, warning and adjustment: seismic monitoring, hazard mapping, land-use zoning and building codes reduce vulnerability.

Power: vulnerability is socially produced — the same magnitude event kills far more where wealth, governance and preparedness are weak.

What drives disaster risk?

Leisure, tourism & sport

This theme studies participation, tourism systems and their futures. Two big ideas at HL:

• Butler's resort life-cycle (TALC): exploration → involvement → development → consolidation → stagnation → rejuvenation or decline.
• The tourism multiplier: spending circulates through the local economy — but leakage to foreign-owned firms reduces the benefit.

Possibilities: carrying capacity and "overtourism" are the sustainability debates the exam rewards — weigh the economic gains against social and environmental costs.

Name the Butler stage

Food & health

This theme links food systems to health and the geography of disease at HL depth:

• Food security — availability, access, utilisation, stability; famine is usually about access and power, not just supply.
• Disease diffusion — expansion, relocation and hierarchical diffusion across scales.
• The epidemiological transition — a shift from infectious to non-communicable "diseases of affluence" as places develop.

Places: the same yield can mean security in one place and hunger in another — entitlements matter as much as production.

Urban environments

Over half the world lives in cities. HL depth covers urban systems and resilience:

• Processes: urbanisation, suburbanisation, counter-urbanisation, re-urbanisation.
• Challenges: informal settlements, the urban heat island, congestion and unequal access to services.
• Resilience & possibilities: smart, eco and resilient-city strategies for sustainable futures.

Match the concept to its option

Tap a concept on the left, then its matching theme on the right.

Extended, evaluative writing

HL Paper 1 gives longer, higher-tariff essays. Top answers:

• Use named, located examples and precise process detail.
• Build a two-sided argument and weigh the evidence.
• Move between scales and reach a justified judgement.

Command terms: "examine", "evaluate", "discuss" and "to what extent" all demand argument and a conclusion — never a list.

Spot the top-band answer

The big ideas to know

You've toured all seven Paper 1 options at HL depth. Press Finish to see your score.