Reading your schoolyard: a first soil survey
Four lessons taking one patch of ground from guesswork to a record the class can defend. Children choose their own sample points, argue about what counts as representative, and produce a survey a second class could repeat.
A patch of ground you can dig in, or permission to use one nearby. Trowels or sturdy spoons, a jar per group, water, a ruler, and the recording sheets. No kit, no budget.
Lesson 1 · What we already think is under there
Before anyone goes outside, ask the class to draw what they believe is under the grass, to scale, labelled. Do not correct anything. Collect the drawings — they are the pre-survey record and you will return them in lesson four.
The drawings will disagree with each other. That disagreement is the lesson: we are not going outside to confirm what we already think, we are going outside because we do not actually know. Ask the question that runs through the whole unit — how would we find out, and how would we know we were right?
Use a park, a verge, or a planter, and treat access as part of the lesson: who decides what happens on this ground, and how would you find out? Classes working from a borrowed site have consistently produced better questions than classes with their own plot.
Lesson 2 · Choosing where to dig
Each group chooses three sample points and must justify each one to another group before digging. Expect them to choose the easy corners. Let them, then ask what their survey would miss — the answer is the point of the lesson, and it is stronger for having been discovered rather than told.
Introduce one rule: every point must be findable again by someone else. A group that cannot describe where they dug has not produced a record, only a memory.
| Their method | What it misses |
|---|---|
| Wherever is easiest to dig | Compacted ground, which is most of a schoolyard |
| Where it looks most interesting | The ordinary ground the site is mostly made of |
| Evenly spaced across the plot | Little, which is why surveyors do it |
Our three sample points
Put the soil back the way you found it. If your group cannot say where a point was, mark the sheet lost rather than guessing. A survey with two honest points is worth more than one with three invented ones.
What our survey cannot tell us
Return the lesson-one drawings. Ask each child to mark, on their own drawing, one thing they got right and one thing they got wrong. Nobody marks anyone else's.
Then put the harder question: our survey covered nine points across one plot on one afternoon. List, as a class, everything it cannot tell us. Expect a long list — the seasons, the depth below a trowel, what the ground was before the school, whether the wet corner is always wet. This is not a failure of the survey. It is what defines its edge, and knowing that edge is the difference between a record and a claim.
| Level | A child at this level can |
|---|---|
| Working towards | Describe what they found at their own point, in their own words |
| Expected | Record it so another group could find the point and check |
| Greater depth | Name something their own survey cannot answer, and say what they would need to answer it |
Four of the thirty-four pages. The full unit adds lesson three, the second and third recording sheets, the editable versions, the opening slide deck, and the worked assessment example. Written by R. Adeyemi, trialled across three schools. $12 for one classroom, licensed to you for as long as you teach it.