小学科学教材里面问题土壤里有什么实验步骤我没教过科学这个问题我不明白请老师帮忙解决一下好吗谢谢老师了 小学科学《土壤里有什么》说课稿

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实验名;怎样把土壤中粘土和砂分开.
实验材料:烧杯、玻璃棒、水、土壤
实验步骤:1.在烧杯中装半杯水
2.把土壤慢慢倒入水中
3.用玻璃棒沿一个方向轻轻搅拌
4.静置一会,观察水中的土壤
实验现象:土壤分成了两层,
实验结论:上层的土壤颗粒小,是粘土;下层的土壤颗粒大,是砂

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