Nature: Landscapes 自然：风景地貌

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1 : A very deep valley with steep sides is called a ________.

2 : A lot of undiscovered animals live in the world's ________.

3 : Watch out for the edge of the ________. It is very steep.

4 : ________ are important to the world's water resources.

5 : A ________ is another name for a large flat area of land, which is covered in grass with few trees and is usually found in hot countries.

6 : A ________ is flat land that is usually found high above sea level.

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