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great numbers of people, and then it closed. It was also thought that those people would 4) vanish forever. But now we know this is not what really happens.
What we need to fear most is the effects of a serious earthquake, including fires, floods, and landslides. A powerful earthquake 5) occurred in Yellowstone National Park on August 17, 1959. The earthquake was 6) massive and very strong. It also caused the worst landslides in US history since 1927.
After the earthquake, some people said that they would never visit Yellowstone, because they were afraid they would be 7) caught in such a disaster caused by the earthquake. This is actually a foolish idea. Such a fear would 8) keep us away from beautiful mountains for the rest of our lives. Even though earthquakes happen every day, such a powerful earthquake like the Yellowstone one does not happen frequently at all. We should feel 9) grateful that very few of us will suffer such a bad natural disaster. Besides, if we know10) in advance and make careful preparations, the loss of lives could be avoided.
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