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~Ms. B. Frazier’s 3rd Grade Class ~ Social Studies Notes for the Week Map Skills * The United States has many different landforms. Landforms are natural features on Earth’s surface: plains, mountains, rivers, lakes, valleys and hills are natural landforms. Students should know 2 major mountain ranges and 5 major rivers of the United States: Colorado River – flows out of Rocky Mountains. Mississippi River – longest river in the U.S. Rocky Mountains – the highest mountain range in the United States