Chapter 1 Section 4 "Circle Structure of the Earth" ppt (compulsory one in Chinese version) courseware

The Chinese version of the compulsory one, Chapter 1, Section 4, "Circle Structure of the Earth" ppt scenario is imported at 13:46, Beijing time, March 11, 2011. A magnitude 9.0 earthquake occurred in the Pacific Ocean east of Miyagi Prefecture in Northeast Japan. This is an earthquake that happened "in the past 1200 years" in Japanese history. Although Japan's experience in dealing with earthquakes is very mature, the earthquake intensity is extremely rare, so it is expected to cause economic losses of "tens of millions of dollars" to Japan.

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