TPO63听力Lecture1原文+MP3+题目+答案下载

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TPO63听力Lecture1原文+MP3+题目+答案下载

TPO63听力Lecture1原文：

Listen to part of a lecture in a geology class.

Okay. Before we began, I want to remind you that our field trip to Bryce Canyon National Park is this weekend. Remember, the bus leaves early, 5 a.m. so don’t forget to set your alarm clocks. I think you are all gonna enjoy getting out of the classroom and actually seeing some remarkable geologic phenomena.

Now, while we are there, I want you to pay particular attention to two things, one obviously would be the sediment layers making up the rocks, since we’ve spent so much time on sedimentary rocks. Bryce Canyon is a great place to see how millions of years have turned layers and layers of tightly packed sediment, mud particles, sand, remains of plants and animals, into rock.

But you are also gonna see some fascinating rock shapes, formations that are the result of the weathering and the erosion processes that occurred at Bryce Canyon. There are two main processes that are important.

The first one is a weathering process called frost wedging. Frost wedging is a process that widens cracks in rocks in the winter time. It begins with warm air or daytime sun melting the snow. As the snow turns into water, it seeps into the cracks that occur naturally in sedimentary rocks. At night, this water freezes in the cracks, but when water freezes, it expands quite a bit, which means that it pries cracks open, gradually making them wider, and breaking up the little bits in the process. Now, this thaw-freeze cycle can happen as many as two hundred times in a single year, so that makes it the most important weathering process at Bryce Canyon.

The other key process is runoff, which is an erosion process.Runoff takes place in the summer, the parks in the deserts the grounds very dry. When it rains in late summer, the ground is too hard to absorb the water, so it runs off. And as it runs off, it carries away the gravel, the broken bits of rock created by frost wedging in the winter. So runoff is the main erosion process that alters the rock landscape in the park.

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TPO63听力Lecture1题目：

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