A Complete Collection of 100000 Whys
Fav十万个为什么
为什么大部分地球表面是水？
地球表面大部分是水，主要基于以下几个原因：
1、地球形成初期的水来源：地球形成初期，氢元素与岩浆海洋的相互作用，以及富含水的陨石物质（如顽火辉石球粒陨石）释放的氢，共同为地球提供了丰富的水资源。
2、地球引力与水循环：地球的引力场能够束缚住水分子，防止其逃逸到太空。同时，水循环系统（包括蒸发、降雨和地表径流）使水在地球表面得以持续分布。
3、板块构造与海洋形成：地球的板块构造运动使得海洋地壳不断更新，形成了广阔的海洋盆地，为水的存储提供了空间。
总结：地球表面大部分是水，主要归因于地球形成初期水的来源、地球引力的束缚作用以及板块构造对海洋盆地的塑造。这些因素共同作用，使地球成为一个以水为主体的星球。
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