沿着加勒比板块东部边缘的岛链是当大西洋扩张时加勒比板块被向上推而形成的。
The island chain along the eastern edge of the Caribbean Plate was formed when the Caribbean Plate was pushed UP during expansion of the Atlantic.
随着美国的不断扩张和白人不断向西部迁移，对良好的交通条件的需求越来越强烈，他们希望能够修建从大西洋横贯整个大陆到达太平洋的铁路。
As America grew and white settlers moved west, many felt a great need for good transportation. They wanted railroads that reached across the continent from the Atlantic Ocean to the Pacific Ocean.
这两个科学家提出，大西洋海底正在从裂缝处往两边扩张。
The two scientists proposed that the floor of the Atlantic Ocean is moving away from each side of the split.
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