英語聽力 學(xué)英語,練聽力,上聽力課堂! 注冊 登錄
> 在線聽力 > 有聲讀物 > 英語雜志 > 英語聽力文摘 >  第535篇

英語聽力文摘520 火山與水

所屬教程:英語聽力文摘

瀏覽:

手機(jī)版
掃描二維碼方便學(xué)習(xí)和分享
https://online2.tingclass.net/lesson/shi0529/0007/7643/520.mp3
https://image.tingclass.net/statics/js/2012
Volcanos and Water

Firefighters use water to battle a towering inferno.You might wonder if water could also stifle an erupting volcano. Actually, this experiment happens every time a volcano erupts at the bottom of the ocean. What happens when a volcano erupts underwater? We'll find it out on today's moment of science.

Most of the world’s volcanic action happens an average of eight thousand five hundred feet underwater. Deep beneath the waves there are an estimated one million volcanos. As with land volcanos, molten lava pushes up from beneath the sea floor at thousands of degrees Fahrenheit.

Ocean water can’t “put out” the volcano the way firefighters put out a fire, but it does have a profound effect on what happens to the lava once it’s out of the ground. The biggest difference between undersea and land volcanos has nothing to do with water’s wetness, but with its pressure.

At these depths, the water pressure can be two hundred and fifty times more powerful than air pressure at the Earth’s surface. This prevents bubbles from forming in the lava, eliminating the likelihood of an explosive eruption like some land eruptions are.

Instead, lava squeezes out of the ground like toothpaste out of a tube, forming glassy rock formations that look like long, stacked pillows. The pressure is so high that steam never even forms where lava touches water. You could be in a boat over a giant, erupting volcano, and never even know it was there.

So,you can’t put out a volcano with water. But on our next program, we’ll find out what happened to a town that tried to do this anyway–and in a way succeeded!

用戶搜索

瘋狂英語 英語語法 新概念英語 走遍美國 四級聽力 英語音標(biāo) 英語入門 發(fā)音 美語 四級 新東方 七年級 賴世雄 zero是什么意思南京市容城嘉苑英語學(xué)習(xí)交流群

網(wǎng)站推薦

英語翻譯英語應(yīng)急口語8000句聽歌學(xué)英語英語學(xué)習(xí)方法

  • 頻道推薦
  • |
  • 全站推薦
  • 推薦下載
  • 網(wǎng)站推薦