This class focuses on rivers around the world. First, it explains the definition of a river as a natural stream of water that flows through land and empties into a sea or lake. It also describes key parts of a river such as the source and the mouth, emphasizing that rivers carry fresh water from high places to low places, and this fresh water can be used for daily life, agriculture, and to sustain plants and animals.

Main Content:
1.The Mysteries of Rivers: Definition, Characteristics, and Functions
2.Section on Introducing Major Rivers in the World

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