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跨学科
地理 How do you describe the surface of one thing? Round? Square? Or smooth? You may have different a
1. But we know that we can describe the earth’s surface through landforms. A landform is a natural mixture (结合体) of rock and soil found on the earth. Landforms come in different kinds of s
2 and sizes. The whole mountains, small hills, plateaus (高原), and plains are the four main kinds of landforms. A landform might be as h
3 as land or as small as a pool.
Landforms are made by some kinds of forces (力) of nature. These forces could be wind, water or ice. And it usually t
4 a very long time to form different landforms. It could be hundreds or thousands of years or even longer. For example, you m
5 have seen many valleys (山谷) before. It used to be a high hill, but with time going by, water and wind wear down high land into a plain, and then create valleys. Water is able to f
6 many landforms. But the processes (过程) happen over a long time, sometimes m
7 of years.
What are the differences a
8 the landforms? Valleys are located between hills or with many high mountains around. And there is usually a river at the bottom of the valleys. A delta (三角洲) is another landform created by water. Deltas can be found at the mouths of rivers. They are created w
9 sand, soil, and rock mix together. Hills and mountains are another two landforms. A hill is raised land. A mountain is usually higher with a top. Most mountains are like towers. But a few of them have f
10 tops. The mountains look like tables.
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