《地球上的水》ppt课件.ppt

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1、地球上的水三蓝色的地球“机遇号”火星探测器在干什么？结合你的生活经验，举例说明地球上的水都存在于哪里？地球区别于其他星星的主要特征之一：有丰富的水根据水的状态不同，可分为三类：液态、固态、气态。根据水中所含成分不同，可分为两类：淡水、咸水。根据水的分布空间可分为四类：海洋水、陆地水、大气水、生物水.海洋水96.53%2.53%湖泊咸水和地下咸水0.94%冰川水68.69%地下淡水30.06%其他水体永冻土底冰0.86%土壤水0.05%湖泊淡水0.26%沼泽水0.03%河流水0.006%生物水0.003%大气水0.04%你用什么方法可以证明在我们周围的空气中也有水呢？例：雨、雪、雹、

2、露、云、雾；湿衣服晒干、各种蒸发现象；盐“发潮”；冰箱制冷时，冷冻室内有霜；食品袋内有干燥剂有吸水作用。二、水与生命生活在沙漠中的骆驼刺，叶子为细刺，根系发达，你能解释这种现象吗？有些动物不常饮水。是不是它们不需要水？请阅读课本P4－P5，了解水对生命的重要性：1.人体内含量最多的物质是什么？2.含水量最多的生物体是哪种？3.一个健康的成年人，每天平均需要水＿＿升？jixi.99114.com/pifa-119/jixi.99114.com/pifa-130/jixi.99114.com/pifa-123/jixi.99114.com/pifa-122/jixi.99114.com/

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