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2024-08-31 17:18本頁面
【正文】 gular rise and fall of ocean waters, at definite times each day, but a tidal wave es rushing in suddenly and unexpectedly. A tidal wave is caused by an underwater earthquake. Scientists call the underwater earthquake a seaquake. The word “seaquake” is made up of two words, the word “sea” which means “ocean” and the word “quake.” “To quake” means “to shake” or “to tremble.” When a seaquake takes place at the bottom of the ocean, the ocean floor shakes and trembles, and sometimes the ocean floor shifts. It is this shifting that produces the tidal wave. The tidal wave begins to move across the sea at great speed. Tidal waves have taken many human lives in the past. Today scientists can predict when a tidal wave will hit land. They use a seismograph to do this. A seismograph is an instrument that records the strength, the direction, and the length of time of an earthquake or seaquake. It is not possible to hold back a tidal wave, but it is possible to warn people that a tidal wave is ing. This warning can save many lives.Listening Factoid 1 The largest wave known was not a tsunami. It was caused by a landslide that sent about 100 million tons of rock crashing into a bay in Alaska in 1958. The slide produced a single wave which covered the hills on the opposite side of the bay up to a distance of nearly 1,700 feet inland. Then the wave, which was 200 feet high, raced back out to sea. No one was killed. Listening Factoid 2 The speed of a tsunami depends on the depth of the water in the ocean. The deeper the water, the faster the tsunami moves.
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