十万个为什么

                
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                "title": "地球名片",
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            {
                "title": "地球同步轨道和地球静止轨道",
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            {
                "title": "雪球地球",
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            {
                "title": "地球型生命",
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            {
                "title": "地球的保护层",
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            {
                "title": "地球的磁层",
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            {
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            {
                "title": "为什么地球“发烧”了",
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            {
                "title": "地球为什么会转圈？",
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            {
                "title": "“雪球地球”假说",
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            {
                "title": "怎样才能飞出地球",
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            {
                "title": "地球为什么不发光？",
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            {
                "title": "为什么地球上有氧气",
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            {
                "title": "地球会突然变冷吗",
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            {
                "title": "超新星爆发会不会影响地球",
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            {
                "title": "为什么地球不是圆的？",
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                "title": "彗星会撞上地球吗？",
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            {
                "title": "地球上共有多少水",
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            {
                "title": "为什么地球两极特别寒冷",
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                "title": "为什么地球两极特别冷",
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            {
                "title": "为什么地球内部非常热",
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            {
                "title": "地球上的能源来源",
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            {
                "title": "什么是数字地球",
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                "title": "为什么湿地被称为“地球之肾”",
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            {
                "title": "为什么要研究地球的历史",
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            {
                "title": "为什么地球会绕轴自转？",
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            {
                "title": "地球上什么时候开始有生命",
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            {
                "title": "地球自转1周正好是1天吗",
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            {
                "title": "为什么地球会绕轴自转",
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                "title": "地球将会有怎样的归宿？",
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            {
                "title": "地球为什么是一个椭球体？",
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            {
                "title": "地球曾是个大雪球吗",
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                "title": "地球是怎样形成的？",
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                "title": "为什么地球上有那么多沙漠",
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            {
                "title": "只有地球上才有海洋吗",
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                "title": "为什么地球内部分了许多圈层？",
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            {
                "title": "为什么地球会有磁场",
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                "title": "为什么地球会自转",
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            {
                "title": "地球为什么会有引力？",
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            {
                "title": "另一个地球在哪里",
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            {
                "title": "什么是“地球之音”",
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            {
                "title": "火箭怎样才能飞出地球？",
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                "title": "为什么月球和地球形影不离？",
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            {
                "title": "地球到月球到底有多远",
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                "title": "为什么要建数字地球",
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        "title": "地球名片",
        "content": "质量：5.974×\\(10^{24}\\)千克 平均密度：5515千克/\\(米^{3}\\) 体积：1.083×\\(10^{12}\\) \\(千米^{3}\\) 赤道半径：6378千米 极地半径：6357千米 分层（由内至外）：地核、地幔、地壳 地球系统：岩石圈、生物圈、水圈、大气圈 海陆分布：约29.2%（1.4894亿平方千米）是陆地，70.8%（3.6113亿平方千米）是海洋",
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