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3.2水的星球(小学科学2024新教材教科版三年级下册科学)

  • 2026-06-08 13:29:46
3.2水的星球(小学科学2024新教材教科版三年级下册科学)
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教学思路

在课程标准中的位置
核心概念：10.地球系统
学习内容与要求：
3~4年级：10.2水循环。③知道地球表面的海陆分布情况，说出河流、湖泊、海洋、冰川、地下水等主要水体类型。
学业要求：
3~4年级：能说出地球表面海陆分布的概况和主要水体类型；对天气、水体、岩石、土壤等事物具有好奇心和探究热情，乐于动手实验，如实记录观察结果，具有用事实说话的意识。
《水的星球》选自小学科学教科版三年级下册《只有一个地球》单元第2课，本课主要是学生大致了解地球上的水体类型，知道地球上有丰富的液态水，比较地球表面的海陆分布情况。
在聚焦环节观察外太空看地球的图片，初步感受地球是一个蓝色的星球的说法。从水的词语出发，感受水体类型的多样和丰富的水资源。在此基础上根据已有的经验说说知道的水体类型，从水的不同状态认识水体类型，感受水在我们的生活中无处不在。继续从地球仪上认识不同的水体，感受丰富的水资源，明白地球是一个蓝色星球的说法。继续引导学生猜测地球上海洋面积和陆地面积的大小比较，并学习用科学的方法（数格子或数十指）来验证自己的猜测，教师引导学生选择使用数格子的方法进行验证，明确数格子的计算方法和判断方法，学生利用此方法来比较地球表面的海洋面积和陆地面积大小，认识到地球是一个水的星球，有着丰富的液态水资源。随后，说说液态水对于生物的作用，感受水是生命之源的重要性，在此基础上通过地球上水资源的大致比例意识到淡水资源的不足，培养学生节约用水的意识和习惯。

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通过网盘分享的文件：3.2水的星球.pptx

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  1. CONNECT:[ UseTime:0.000862s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000737s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000281s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000436s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000517s ]
  8. SELECT * FROM `article` WHERE `id` = 468508 LIMIT 1 [ RunTime:0.000407s ]
  9. UPDATE `article` SET `lasttime` = 1781054818 WHERE `id` = 468508 [ RunTime:0.014686s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000304s ]
  11. SELECT * FROM `article` WHERE `id` < 468508 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `article` WHERE `id` > 468508 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000585s ]
  13. SELECT * FROM `article` WHERE `id` < 468508 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004390s ]
  14. SELECT * FROM `article` WHERE `id` < 468508 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002337s ]
  15. SELECT * FROM `article` WHERE `id` < 468508 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000701s ]
0.176958s