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Mountains, plateaus, valleys, and plains are examples of Earth's various
landforms. Some of these landforms were formed as a result of rocks breaking down
and erosion. Soil erosion is a naturally occurring phenomenon that affects all
landforms. Soil is a non-renewable resource that cannot be renewed after it has been
eroded. Soil erosion is the irreversible change of the characteristics of the soil. In
agriculture, it refers to the natural physical forces that wear away the topsoil.
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