The oceanic plate is made of denser and heavier rock, so it begins to sink down under the continental plate and into the mantle.
海洋板块是由密度更大、更重的岩石构成的，所以它开始下沉到大陆板块之下，到地幔之中。
2
Basalt is one of the Earth's most common rock formations, making up 10 percent of the continental crusts.
而玄武岩是地球上最常见的岩层，形成了10%的大陆壳。
3
Continental Illinois in America and Johnson Matthey Bankers in Britain were rescued in 1984, because regulators judged that the Banks were large enough to rock the whole system should they go bust.