TEXT A
-WHAT IS A TSUNAMI
A tsunami is a string of large ocean waves. Some people call it a “wave train" or a "tidal wave." Tsunamis, unlike normal ocean waves, are not caused by tides. The word tsunami comes from the Japanese. Tsunamis are caused by a sudden, large motion on the ocean floor. They can be caused by an earthquake under the ocean. Sometimes an underwater landslide or volcano is the cause. When one of these tilings happens, the energy passes through the ocean water. Just like the ripples from a rock being thrown into a pond, the energy released by one of these motions spreads One in all directions.
The energy can travel many miles away. Tsunamis move at high speeds. Most tsunamis happen in the Pacific Ocean. In the deep walers, a tsunami may travel -150 miles per hour. Out in the ocean, a tsunami may be hard to see. As it comes close to shore, its speed slows down. The height of the wave builds. The tsunami may suddenly rise into a wave ten to one hundred feet high. These large waves are a disaster for coastal regions and people living there. Tsunami warning networks alert people living along coastlines in the Pacific Ocean. When a warning is sounded, people can move away from the coast to higher ground. The wavelength can be as long as 150 miles. This means the time (wave period) between the giant waves is long, too. Giant waves on shore call last for hours or even days alter the earthquake or other disturbance. ((TA8.Unit 4))
1. "Wave train" or "tidal wave" is another term for tsunami.
- Most of the time.
I write about blizzards, typhoons, floods, and so on. But I don't ski in a blizzard or get wet in a flood. Well, this week's blog is different, because (his time I was there when something big happened!
I was on holiday in an area which has earthquakes. I knew (hat before I went. But (he last big earthquake there happened 50 years ago. so I didn't really think about it when 1 booked.
During the first few days. I went swimming every morning in the warm sea and then, in the afternoon, I walked up the side of the mountain behind the town. 1 didn't climb over rocks or anything like that. I just walked slowly up a few hundred meters on one of the old donkey tracks.
On the afternoon of the fifth day. I was on the mountain w hen the ground started to move. I remembered about the earthquakes then, and I thought, 'The ground will open up and i'll fall ill.' Then I looked down al the town and saw a huge wave coming very fast towards it. Houses near the beach disappeared under the water. I was safe on the side of the mountain, but my hotel fell down and I lost all my stuff.
TEXT C
- The emergency announcement
- Sent: 21:36 June 3
- What: A heat wave
- Where: Oakland City
- When: From 10:00 June 4 to 16:45 June 9
- The heat wave is now going on in the city.
- The highest temperature may hit 40oC.
People with weight and alcohol problems may gel heatstroke. 1 he heat wave might affect other systems across the city. Water and electricity shortage may happen during the heat wave.
Instructions:
- Wear .1 hat or carry an umbrella with you It you re outùiuc.
- Get enough water and as Old Migary drink"
- Exercise gently.
- Come and see your family, friends and neighbors, especially older people.
- If someone gets heatstroke or heal exhaustion, contact the emergency ser\ ices immediately.
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