流利说懂你英语L4-U1-P1 Vocabulary

——Landforms——

1.Mountainsare landforms higher than 2000 feet or about 600 meters above sea level.

2.Hills are like mountains but not as tall.

3.Mountains are form by forces deep within the earth and are made of many typesof rocks.

4.Rivers are steams of water that usually begin in mountains and flow into thesea.

5.Many early cities were built along rivers.

6.Most of the world’s water is in the oceans, which are large bodies of saltwater.

7.The oceans are also an important source of oxygen.

8.Deserts are areas of land receive little or no rainfall.

9.The amount of rainfall in some deserts is so low that only a few plants cansurvive.

10.A valley is a low relatively flat area between hills or mountains often with ariver running through it.

11.Some valleys are formed by flowing water, and others are formed by glaciers.

12.Many early civilizations developed near rivers