They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past.
因此，它们可以重现海底扩张的过程，以及大陆和大洋盆地过去的地理位置发展过程。
2
Ocean scientists study the chemical make-up of the ocean, weather patterns, the geography of the ocean floor, and many other areas.
海洋科学家研究海洋的化学成分、气候模式、海底地貌以及许多其他领域。
3
Beijing also has geography to battle. It is ringed by mountains on three sides and far from the ocean, trapping pollution as if in a bowl.