After rain, find the best puddle and investigate it systematically: estimate depth with a stick, draw the outline with chalk, test what floats vs. sinks. Mark the puddle edge and return in 30 minutes to see how much it shrank. The puddle becomes a lab.
What you need
- chalk (optional)
- stick
How to do it
- 1Find the best puddle. Measure depth with a stick. Make an estimate before you look.
- 2Drop a leaf, a twig, a stone, a bit of bark. Floats or sinks?
- 3Mark the puddle's edge with chalk.
- 4Return in 30 minutes. How much of the chalk line is now on dry pavement?
Variations
- If they're not interested: try a simpler version of the activity or move on without pressure. Interest often returns after a break.
- Wind down with a final round or a cooling-off activity. End before frustration sets in.
💡 Parent tip
On hot sunny days the shrinkage visible in 20 minutes is dramatic enough that even 3-year-olds are genuinely surprised.
What your child develops
- Scientific method — forming a prediction and checking it
- Cause and effect — understanding evaporation as a visible process
- Density intuition — why some things float and others sink
Safety notes
- Boots recommended. Keep children away from deep or fast-moving water.
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