If you take only one idea from how Mercator teaches, take this one. Every geography topic is two halves bolted together, and the halves have to be taught together or the subject doesn't make sense.

The two halves are place and process. Place is where and what's distinctive about it. Process is how it got that way, including both physical and human processes. Get one without the other and you've got either an atlas-trivia exercise or a textbook abstraction. Get both, and you've got geography.

This article walks through how Mercator pairs them on a real topic.

What "place" actually means in a Mercator session

Place is more than a name on a map. A useful KS3 description of any place includes:

  • Location — where, exactly. Country, region, ideally coordinates or a recognisable landmark relationship.
  • Physical setting — coastal? Mountainous? Low-lying? On a plate boundary? Inside or outside a major climate zone?
  • Human setting — population density, economic profile (rich/poor, agricultural/industrial/service), recent history.
  • What's distinctive — what makes this place worth talking about for this topic specifically? Why this place and not another?

Mercator will probe for all four. A student who says "Bangladesh" gets the follow-up: where in Bangladesh, what's special about its physical geography, who lives there, why is it relevant to this topic? If the answers come back vague, the session works on those before continuing.

What "process" actually means

Process is the how. The thing that makes a description into an explanation. For any topic Mercator typically distinguishes between:

  • Physical processes — tectonics, weather and climate, river processes, coastal processes, biological processes within ecosystems.
  • Human processes — migration, urbanisation, industrialisation, government decisions, trade, cultural change.

The two interact constantly. A coastal town floods. The physical process is tide-and-storm; the human process is decisions about where to build and what to defend. KS3 geography is at its strongest when these two are linked rather than separated, and weakest when they're split into "physical geography" and "human geography" lessons that never speak to each other.

A worked pairing: the Holderness coast

This is one of the canonical KS3 case studies — the fastest-eroding coastline in Europe, in East Yorkshire, losing land at around 2 metres per year on average.

A Mercator session on it would unfold like this.

Place

  • Location. East coast of England, between Flamborough Head and Spurn Point, in the East Riding of Yorkshire.
  • Physical setting. Cliffs made of boulder clay (soft, glacial). North Sea coast, exposed to long fetches from the north-east. Mostly low cliffs, no significant offshore protection.
  • Human setting. A mix of small towns (Withernsea, Hornsea), agricultural land, individual farms and houses. Sparse but real population. Some areas defended, some not.
  • What's distinctive. Soft geology + exposed orientation + long fetch + sparse population = the fastest erosion rates in Europe, with a politically interesting question about which villages to defend and which to let go.

Process

  • Physical process. Wave action erodes the soft boulder clay through hydraulic action and abrasion. Storms accelerate it. Slumping after rain weakens cliffs further. Beach material is moved south by longshore drift.
  • Human process — past. Villages have already been lost over the centuries; over 30 named medieval settlements no longer exist. Defences were patchy historically.
  • Human process — present. Some areas (Hornsea, Withernsea) are defended with sea walls and groynes. Others are under formal "managed retreat" — the government has decided not to defend them.
  • Why the different responses? Cost-benefit. The cost of defending a few farms outright would be enormous. Concentrated towns are worth more to defend.

By the end of the session, the student should be able to write a paragraph that links the place (soft cliffs, exposed coast) to the process (erosion mechanics, longshore drift) to the human consequences (lost villages, managed retreat). That paragraph is what KS3 geography is meant to look like.

The scale ladder

Every topic also gets examined at multiple scales, because geography that sticks at one scale tends to be wrong at others.

For Holderness, the scales look like this.

  • Local. A specific village, a specific farm, a specific year. "In 2009, Crackington Farm lost three fields and the farmhouse."
  • Regional. The Holderness coast as a 60-kilometre system, with longshore drift moving material southward to feed Spurn Point.
  • National. Coastal management policy in England — the Shoreline Management Plans, the hold-the-line vs managed-retreat decisions, the politics of who funds what.
  • Global. Sea-level rise from climate change is accelerating the underlying problem. Holderness is a leading edge of a problem most coastal nations will face.

Going up the ladder explains the bigger pattern. Coming back down forces specificity. Mercator does both ways in nearly every session.

SEEP — the four-dimension check

A consistent move in any Mercator session is the SEEP check. Social, economic, environmental, political. After the physical/human work is done, the impacts of a topic are checked across all four. Holderness, briefly:

  • Social. Loss of community, particularly older residents who can't relocate easily. Schools and post offices closing in affected villages.
  • Economic. Farmland lost. Property values falling. Tourism affected in undefended sections. Defending towns is expensive.
  • Environmental. Habitat loss. But also — paradoxically — new habitat created at the southern accretion zone (Spurn Point). Geomorphologists would argue the system is "natural"; it's only a problem from a human perspective.
  • Political. Who decides what to defend? Funding from central government vs local authority. Tension between national policy (managed retreat) and local interest (please save my village).

A KS3 student who can run SEEP on Holderness can run it on any topic. It's the most portable framework in geography teaching.

When the pairing breaks

Two warning signs Mercator watches for.

Place without process. The student can name Bangladesh and say it floods. They can't say why specifically. They've collected the place but not the process behind it. Mercator's prompt: "what is it about Bangladesh's physical geography that makes this happen here and not, say, in the Netherlands?"

Process without place. The student can explain how rivers form deltas. They can't name a delta. The process is abstract, ungrounded, hard to use in writing. Mercator's prompt: "name three deltas you can talk about specifically. Which is most relevant for this question?"

Both are KS3-typical. Both are easy to fix once spotted. The fix is just to do the missing half, then re-bolt them together.

Jason runs aitutors.me. He has a Year 8 child and about fifteen years of building software adjacent to education. Updated 21 May 2026.