earthquake【精品课件】.ppt

Earthquakes Lesson 26 Book 1 The earth is a little blue planet. There always happen some disasters (灾祸) such as floods,drought, volcanoes (火山), hurricane（飓风）, desert（漠化） and earthquakes … Paragraph 2 Another earthquake shook San Francisco on October 17th, 1989. It was America’s second strongest earthquake and about 100 people were killed. It happened in the evening as people were traveling home. A wide and busy road which was built like a bridge over another road fell onto the one below. Many people were killed in their cars, but a few lucky ones were not hurt. Luckily the 1989 earthquake did not happen in the center of town but about 50 kilometers away. In one part of town a great many buildings were destroyed. These buildings were over 50 years old, so they were not strong enough. There were a lot of fires all over the city. The electricity was cut off for several days too. Paragraph 1 Fill in form Paragraph 2 Another earthquake shook San Francisco on October 17th, 1989. It was America’s second strongest earthquake and about 100 people were killed. It happened in the evening as people were traveling home. Paragraph 2 Paragraph 2 Many people were killed in their cars, but a few lucky ones were not hurt. Paragraph 3 Luckily the 1989 earthquake did not happen in the center of town but about 50 kilometers away. In one part of town a great many buildings were destroyed. Paragraph 3 These buildings were over 50 years old, so they were not strong enough. Paragraph 3 There were a lot of fires all over the city. The electricity was cut off for several days too. Fill in form Paragraph 4 Why do earthquakes happen? Scientists explain that the outside of the earth is made of a number of different plates. At San Francisco the Pacific plate which is moving towards the northwest meets the North American