- Show pupils photographs, video clips of rivers full after a storm and in normal state and ask them a series of questions,
eg
- Why does the river appear dirty?
- Where has the dirt come from?
- What happens when the water level drops?
- Why does the river become clearer?
- Help pupils to generate key points about transportation and formation of sediment grains from their responses and the responses of others.
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- identify the source of 'dirt' in rivers in flood
- make generalisations about transport and formation of sediment grains,
eg larger grains don't get carried so far
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