They reported that most people had left the city before the eruption. Most people... - Most people were reported to have left the city before the eruption., People believe that Krakatoa was the worst volcanic eruption ever. Krakatoa...  - Krakatoa is believed to have been the worst volcanic eruption ever., At first, people didn't know the Earth goes around the sun. At first the Earth... - At first the Earth wasn't known to go around the sun., It is said that some tourists enjoy visiting the sites of natural disasters. Some tourists... - Some tourists are said to enjoy visiting the sites of natural disasters., It's believed that natural disasters are becoming more frequent. Natural disasters... - Natural disasters are believed to be becoming more frequent., They know that some animals can hear things humans can't hear. Some animals... - Some animals are known to be able to hear things that humans can't hear., They believe that flamingos flew away before the tsunami. Flamingos... - Flamingos are believed to have flown away before the tsunami., People claim that global warming is responsible for many natural disasters. Global warming... - Global warming is claimed to be responsible for many natural disasters.,

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