What caused the change?
Labs / History
Cradles of Civilization
Every year the river floods, drops a band of silt, and renews the soil along its banks. Drag on the land to found a city, then tune the flood's strength and timing. The settlements that sit close to the fertile floodplain grow into cities — the ones stranded in the dry margins starve.
Labs / History / Cradles of Civilization
Cradles of Civilization
Every year the river floods, drops a band of silt, and renews the soil along its banks. Drag on the land to found a city, then tune the flood's strength and timing. The settlements that sit close to the fertile floodplain grow into cities — the ones stranded in the dry margins starve.
Why it matters
Why explore this?
History is about change over time and the choices that shape it. This model helps you compare causes, consequences, and patterns without treating the past as a list of dates.
Explore
Try the model
Year 0Cities 2People 10kFlood dryHarvest 100%
Investigate
Questions to test
Predict first, try it in the model, then use what you observe to answer.
What to try
- Found a city right on the river versus one just inside the fertile band — which grows, and what does the flood crest do to the one in the channel?
- Slide the flood timing until it crests during harvest. Why does a well-fed valley suddenly stop feeding its people?
- Turn the flood strength down. How far from the water can a settlement survive when the silt no longer reaches it?
- Push irrigation reach to the maximum. Can canals let a city thrive where the floodwater never arrives on its own?
- Compare the branching delta of the Nile with the great bend of the Yellow River — where is there the most fertile land to settle?
Explain
Make sense of what happened
Build an explanation with a cause, a change, and a consequence. Then identify evidence from the model and one limitation of what the model can show.
Check
Before you leave
Who or what was affected?
What can this model not tell us?
If you can answer all three using evidence from the model, you understand the main idea. If not, return to Explore and change one setting at a time.