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class="main-left"> <div id="fh3peh5a" class="article"> <script type="text/javascript">s("title_top");</script> <h1 class="title">地球?qū)儆谑裁葱?/h1> <script type="text/javascript">s("content_top");</script> <div id="fh3peh5a" class="answer"><span>回答</span><em></em></div> <div id="fh3peh5a" class="answer_t"> <i class="answer_icon"></i> <span>瑞文問(wèn)答</span> <p>2024-08-05</span> </div> <div id="fh3peh5a" class="explain"> 地球?qū)儆谛行�，按離太陽(yáng)由近及遠(yuǎn)的次序排為第三顆，也是太陽(yáng)系中直徑、質(zhì)量和密度最大的類地行星，距離太陽(yáng)1.5億公里。地球自西向東自轉(zhuǎn)，同時(shí)圍繞太陽(yáng)公轉(zhuǎn)�，F(xiàn)有40~46億歲，它有一個(gè)天然衛(wèi)星——月球，二者組成一個(gè)天體系統(tǒng)——地月系統(tǒng)。46億年以前起源于原始太陽(yáng)星云。 </div> <div id="fh3peh5a" class="content-title"><i></i><h2>擴(kuò)展資料</h2></div> <div id="fh3peh5a" class="content"><p>　　地球赤道半徑6378.137千米，極半徑6356.752千米，平均半徑約6371千米，赤道周長(zhǎng)大約為40076千米，呈兩極稍扁赤道略鼓的不規(guī)則的橢圓球體。地球表面積5.1億平方公里，其中71%為海洋，29%為陸地，在太空上看地球呈藍(lán)色。</p><p style="text-align: center;"><img loading="lazy" src="https://p.9136.com/00/l/b5d8c7f25_2.jpg" alt="地球?qū)儆谑裁葱?/></p><p>　　地球內(nèi)部有核、幔、殼結(jié)構(gòu)，地球外部有水圈、大氣圈以及磁場(chǎng)。地球是目前宇宙中已知存在生命的唯一的天體，是包括人類在內(nèi)上百萬(wàn)種生物的家園。</p></div> <script type="text/javascript">s("download_bottom");</script> </div> <script type="text/javascript">s("list_wenzhangtuijian");</script> <div id="fh3peh5a" class="previous"> <span id="fh3peh5a" class="pre"><a title="峨眉山在哪個(gè)省哪個(gè)市" href="http://m.crossfitfinalpush.com/wenda/152049.html">峨眉山在哪個(gè)省哪個(gè)市</a> </span> <span id="fh3peh5a" class="next"><a title="鼻子的種類" href="http://m.crossfitfinalpush.com/wenda/152050.html">鼻子的種類</a> </span> </div> </div> <div id="fh3peh5a" class="main-right"> <div id="fh3peh5a" class="right_fix"> <script type="text/javascript">s("right_top");</script> <script type="text/javascript">s("right_mid");</script> <div id="fh3peh5a" class="right_box"> <span><em></em>最新文章</span> <ul> <li><a target="_blank" title="熊貓屬于什么科動(dòng)物">熊貓屬于什么科動(dòng)物</a></li> <li><a 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