【正文】
explain that the o of the earth is made of different p . At San Francisco the P plate m the North American plate. When s these two plates jump, an e is felt. When the 1906 earthquake h , the Pacific plate j 56 meters to the north. top ake ure irst long oin etter ock hird ossible all trong We cannot s earthquake, but we can do things to m s they do not destroy whole cities. F , it is not a good idea to build houses a the lines where two of the earth’s plates j together. Second, if you think there may be an earthquake, it is b