Soil become degraded when

Soil degradation describes what happens when the quality of soil declines and diminishes its capacity to support animals and plants. Soil erosion is a part of soil degradation. It's when the topsoil and nutrients are lost either naturally, such as via wind erosion, or due to human actions, such as poor land management.

it is removed by erosion.

Explanation:

Soil become degraded when it is removed by erosion.

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Skye~

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