请注意,您可能有点误解:土地高度/海洋深处,即使地球海洋的%,不太重要,因为当土地侵蚀,它不填写的深度,而是提出了海底和海洋也呈现类似的最高——地球上的水仍然需要的地方去!它仍然只是倾向于土地之上。如果你把一个杯子装满水的一半,然后将沙子倒入水,它不占用所有的水深度,而是提出了杯中的水:[![在这里输入图像描述][1]][1]相关的问题(如果地球是一个球体,大海有多深?)(//www.hoelymoley.com/questions/7446/if-the-earth-were-a-smooth-spheroid-how-deep-would-the-ocean-be)讨论如何如果地球海洋深处成为完美平滑,没有改变的泥浆(问题是,将旧的海底,现在埋下新的泥土,然后逐渐失去它的一些水吗?我认为答案是肯定的,但它仍然是真的有点水可能永久占用额外的泥)。侵蚀过程确实倾向于消除地面。然而,任何导致地面不均匀的垂直运动将抵消。板块构造造山运动和下沉的盘子就会这么做。* *我想答案是显而易见的,在地球构造活动……(如果地球过程中保持足够的水][2],我们最终会有一个ocean-covered星球。** **But on the other hand I'd suspect for a 4.54 billion year old planet, if it weren't for tectonics, the Earth would probably already be long since smoothed out. So it comes down to whether plate tectonics will slow down/change in the long run, which geologists can likely better discuss (and which may be a good separate question to ask). But either way, there will be some important uncertainties [large meteor impacts, global temperatures changes, etc]** **So I'd think the best answer may probably just be: not anytime soon!** [1]: https://i.stack.imgur.com/xyMtV.png [2]: //www.hoelymoley.com/questions/9488/how-much-water-is-the-atmosphere-losing-to-space