Earthquakes are something that most people fear. There are some places that have few or no earthquakes. Most places in the world, however, have them regularly. Some places, like Iran and Guatemala have them frequently. Countries that have a lot of earthquakes are usually quite mountainous.
The most talked about earthquake in the United States was in San Francisco in 1906. Over 500 people died in it. The strongest one in North America was in 1964. It happened in Alaska. Some earthquakes are not always tile ones that kill the most people. In 1755, one of the strongest earthquakes ever recorded was felt in Portugal. Around 20,000 people died.
In 1923, a very powerful earthquake hit the Tokyo-Yokohana area of Japan. A hundred and forty thousand people died. Most of them died in fires which followed the earthquake.
One of the worst earthquakes ever was in China in 1976. It killed a large number of people. The worst earthquake ever reported was also in China. 40
One of the most famous bridges in the world is the Golden Gate Bridge that spans San Francisco Bay. Because it was built in 1937 ,it has become one of the first sights people see if they are coming to San Francisco by ship. The main part of the Golden Gate Bridge is a suspension span. It hangs from steel cables that are supported by two. huge towers, one at each end of the bridge. The suspension span was the longest in the world when it was finished in 1937. It measures 4,200 feet between the towers. The floor of the bridge is wide enough for six lanes of cars, three in each direction. There are sidewalks, too, but not many people use them. It costs a lot of time to go on foot from one end of the bridge to the other.
The years since 1950 have been called the era of the giant bridge. Most of them have been built in the United States. The Mackinac Bridge in upper Michigan was finished in 1958. It is a suspension bridge, with foundations resting on rock 200 feet below th
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