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小学科学知识趣味学3：什么是土壤
熊大和熊二把他们的传家宝蜜罐，埋在了土里。可是第二天，蜜罐却不见了。这其中肯定有蹊跷。熊二拿着放大镜在埋罐子的地方仔细查找，发现土壤边缘光滑，像是用工具挖过的。 更多知识内容，欢迎关注微信公众号 科学嬉游记
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