Answer:
Step-by-step explanation:
The statement that "Structures such as mountains, valleys, and river are examples of landforms" is true. Landforms refer to natural physical features of the Earth's surface, such as mountains, valleys, plateaus, plains, and many others. They are formed through natural processes like erosion, deposition, and volcanic activities. Each landform is formed by different methods and can vary greatly in appearance and location. Therefore, it is not true that there is only one type of landform on the surface of Earth, nor that all landforms are made by similar methods, or that all landforms are similar.