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Listen to part of a lecture in a geology class.
Now we've got a few minutes before we leave for today.
So I'll just touch on an interesting subject that I think makes an important point.
We've been covering rocks and different types of rocks for the last several weeks.
But next week we are going to do something a bit different.
And to get started I thought I'd mention something that shows how uh…as a geologist,
you need to know about more than just rocks and the structure of solid matter, moving rocks, you may have heard about them.
It's quite a mystery.
Death valley is this desert plane, a dry lake bed in California surrounded by mountains and on the desert floor these huge rocks,
some of them hundreds of pounds.
And they move.
They leave long trails behind them, tracks you might say as they move from one point to another.
But nobody has been able to figure out how they are moving because no one has ever seen it happen.
Now there are a lot of theories, but all we know for sure is that people aren't' moving the rocks.
There are no footprints,
no tyre tracks and no heavy machinery like a bulldozer.
uh, nothing was ever brought in to move these heavy rocks.
So what's going on?
Theory NO.1-Wind?
Some researchers think powerful uh…windstorms might move the rocks.
Most of the rocks move in the same direction as the dominant wind pattern from southwest to northeast.
But some, and this is interesting, move straight west while some zigzag or even move in large circles.
请听一段地质学上的演讲。
离下课还有几分钟,我想谈一下某个有趣的话题,
我想这是有重要意义的一点。
过去几周我们一直在讨论各种不同的岩石。
但是下周我们将说到一些不同的内容。
而首先我想我要提到某些显示呃, 作为一位地理学家,
你需要知道的不仅仅是岩石极其固体结构,移动岩石,你们可能听过。
挺神奇的。
死亡山谷就是这种沙漠平面,这是加利福尼亚的一个干涸的湖泊沉积矿,四面环山,而在沙漠地面上,
这些巨大的岩石有的重达几千镑。
而这些岩石会移动,
留下长长的尾痕,随着他们从一地移到另一地,他们留下各种痕迹。
然而没人知道他们是怎么移动的,因为没人目睹过。
如今人们提出很多理论,但我们所能知道的就是这不是人为的。
没有人的足迹,
没有轮胎痕迹,也没有重机械像推土机的痕迹。
呃,没有人带来任何机器移动这些岩石,
那么到底是怎么回事呢?
理论一:风力移动?
某些研究人员认为强劲的风暴可能移动了岩石。
盛行风移动模式是自西南向东北,岩石移动方向一致。
但是有趣的是,某些岩石直线移动,其他一些曲折或甚至绕着大圈子移动。
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