Unit 4 EarthquakesWarming upSan FranciscoSan Francisco San Francisco lies in northern California. At 5:13 on the morning of April 18th, 1906, the city was shaken by a terrible earthquake. A great part of the city was destroyed and a large number of buildings were burned. The number of people who lost homes reached as many as 250,000. About 700 people died in the earthquake and the fires. TangshanThe bridge fell and was not safe for traveling.There was a huge crack cut across the road.The railway