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U U NIT 4NIT 4 土壤和岩石土壤和岩石 S S S S OILOILOILOIL ANDANDANDAND R R R R OCKSOCKSOCKSOCKS drain (排水) Lesson 3 Do They Drain Equally Well? There was a puddle here. Now it is gone. This puddle is still here. Why do some puddles drain quickly? How can you make a fair test? We should add the same amount of soil, sand and stones. We should add the same amount of water. Can water pass through soil, sand and stones? Do they drain equally well? Add some soil, sand and stones into each funnel. Put each funnel into a beaker. Gently pour some water over the soil, sand and stones. What to doWhat to doWhat to doWhat to do soil sand stones 1 2 soil sand stones When will the water stop dripping through the funnels? Measure the time. soil sand stones 3 ResultsResultsResultsResults ConclusionConclusionConclusionConclusion _ can drain water best. Stones How long does it take for water to pass through them? Time(min) Soil Sand stones Stones drain water best. I did a fair test. My teacher told me the answer. I observed the experiments closely. WorkbookWorkbookWorkbookWorkbook You want to know which soil can drain
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