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江河湖海转变为陆地和陆地转变为水域这种情况,在地质历史时期是不断地出现的。在我国许多地方都可以看到海陆变迁的遗迹和某种变迁的过程,所以我国很早就产生“沧海桑田”相互变化的思想,不是偶然的。沧桑变迁是一种地质现象。有三种原因对它起重要的影响:(一)由于地壳运动造成的地面升降,如北欧斯堪的纳维亚半岛一带上升,其间的海水变浅,海湾面积缩小;荷兰
The transformation of rivers and lakes into land and land into water is a constant occurrence in geological history. In many parts of our country, we can see the relics of the land and sea and the process of some changes. Therefore, it is not by chance that our country has long had the idea of changing from one sea to another. Vicissitudes change is a geological phenomenon. There are three main reasons for this: (i) ground movements caused by crustal movements such as rising Scandinavia in the Nordic region, with shallow seawater and shrinking gulfs; Netherlands