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In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
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Article: Check out our tsunami facts and learn some interesting information related to these great walls of water that can cause so much destruction. Find out what causes tsunamis and read about some recent examples of tsunamis that have occurred around the globe. The Japanese word for tsunami means harbor wave. Tsunamis are sometimes called tidal waves but this term has fallen out of favour because tsunamis are not related to tides. Tsunamis are huge waves of water that are usually caused by earthquakes or volcanic eruptions. As a tsunami approaches the shore, water may move back from the coast. If it is shallow enough the water may be pulled back hundreds of metres. If you are in the area, you can know that a tsunami is on the way when you see this phenomenon. Regions in tsunami danger zones often have warning systems in place to give people as much time as possible to move to a safe place. When tsunamis hit shallow water (often near the coast) they slow down but increase in height. An earthquake in the Indian Ocean off Indonesia in December 2004 caused a tsunami that killed over 200,000 people in 14 countries. In March 2011, the Tohoku earthquake off the eastern coast of Japan caused a tsunami that was a major factor in the death of over 15,000 people. The tsunami waves created by the Tohoku earthquake reached a height of over 40 metres in some areas, wiping out coastal towns and causing a number of nuclear accidents.
Answer: Four.
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How many causes of tsunamis are mentioned in the text?

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Article: The audience starts to scream and young people all over Britain turn on their TVs. Yes, it's Top of the pops! Top of the pops is an amazing 45-year-old programme. Pop stars from all over the world appear on this successful TV prograrmme. After about 2340 shows, it's still the most popular pop music show in Britain.So what's the secret? "We get lots of bands to perform live in the studio," says producer Chris Cowey. "That just doesn't happen on other shows" Chris starts the preparations for the programme over a week before it goes out.His first job is to decide which bands to have on the show. When the chart of the top twenty songs is produced on Sunday, Chris can start to book the bands Monday starts with Chris meeting his sound, lighting and camera workers. They listen to each song and plan the show. Tuesday is paperwork day. There are bookings to make sure of, letters to answer and lots of phone calls to make. The show is on Thursday. Bands arrive at the studio from 10 o'clock in the morning and start practicing. Tonight's presenter, Jo Whiley, practises too First the bands go to make up. Judy and Issy are the make-up artists. "We see the stars with no make-up on, looking terrible," says Issy. Then the bands go to the costume department where Marianne dresses the stars. Back in the studio things are happening. The audience is practising their dance moves! It takes over two hours to record the whole programme, then Chris edits it all night long. The final version is exactly 29 minutes long
Answer: The live performances in the studio.
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What make (s) Top of the Pops the most popular in Britain?

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Article: My 16-year-old son, Anton, had gone to the local swimming hole. Most of the kids swim there, and there are plenty of rocks for them to use as safe harbors, so I had no fears for his safety. Still, the firefighter's first words "You need to come up here to the Stillwater River" made me catch my breath, and his follow-up words gave me relief: " Your son is OK." When I got to the river, I immediately saw the firetruck, ambulance and Anton, wrapped with a towel about his shoulders, sitting quietly on a low platform of the fire engine. I hurried over to him. "You OK?"I asked. "Yeah," was all he said. But my eyes begged for an explanation, I didn't get it from my son, however, _ . The story was this: A woman was being swept under water. Hearing the cries, Anton and his friend Tyler, without hesitation, swam out to her, and brought her safely to shore. In an age in which the word "hero" is broadcast with abandon and seemingly applied to anyone who make it through the day, I realized the real thing in my son. The teens are stubborn and self-centred, but that didn't mean they have no desire to do good. Still shocked by my son's daring, I drove him home. Along the way, I tried to dig out some more information from him - but he had precious little to say. The only words he said were, "What's for supper?" I spent some time alone that evening, thinking about the tragedy that might have been. The next morning, when Anton got up, I half expected him to tell me the story. But all he did was toast some bread, pull himself together, and head for the door to start a new day. Watching from the window,1 was reminded that still water often runs deep.
Answer: The rocks can be of help if there's danger.
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Why did the mother allow her son to swim there?