托福TPO69听力Lecture1原文+题目+答案+MP3音频下载

托福TPO69听力Lecture1原文+题目+答案+MP3音频下载

Listen to part of a lecture in a geology class.

So We've talked about the plates that form the earth's Cracks and their movements and how in some places they are separating .Now， when this happens in the ocean along a mid ocean ridge，some important things can happen。In particular，you can get a hydrothermal vent.This is a lot like a geyser except it's on the ocean floor。A geyser of course is a kind of eruption from an underground hot spring.The water that's been heated up in the earth's interior uh uh went under pressure。It can erupt，sending that water and steam shooting upwards through a crack in the earth。A hydrothermal vent is essentially the same thing，but the water is emitted out of cracks or fractures in the ocean floor。If you've heard about hydrothermal vents at all，it's probably because of the exotic life forms around them.Two worms，giant claims that kind of thing forms that don't depend on energy from the sun but depend on chemical energy。

But the events are also of enormous significance for u from a purely geological perspective。 Because the the chemistry of the oceans is affected by them to see how let's look at the process a little more closely。They typically occur in fields.So you might have an area with a dozen of them.......余下听力原文省略！

托福TPO69听力Lecture1题目：

1、(单选题)  

What does the professor mainly discuss?

A. The process by which molten rock can enter the ocean

B. The formation of hydrothermal vents

C. The differences between geysers and hydrothermal vents

D. The mineral composition of hydrothermal vent chimneys

2、(单选题)  

According to the professor, what is the main difference between geysers and hydrothermal vents?

A. Where they occur

B. What causes them

C. The size of their plumes

D. The temperature of the water they emit

.......余下TPO69L1听力题目省略！

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