Which of the following prevents soil erosion?

• A: Afforestation
• B: Eutrophication
• C: Deforestation
• D: None of the above.

Soil erosion is a significant environmental issue, and certain practices can help prevent it. Among the options provided, afforestation is the correct choice.

Why Afforestation Helps

Afforestation involves planting trees in areas that were not previously forested. This practice offers several benefits:

• Root Systems: Tree roots anchor the soil, reducing the likelihood of erosion.
• Vegetative Cover: Trees provide cover that protects the soil from wind and rain.
• Water Retention: Forests help maintain moisture in the soil, further preventing erosion.

Other Options Explained

Let's briefly look at the other choices:

• Eutrophication: This is the process of nutrient over-enrichment in water bodies, leading to algal blooms, not related to soil erosion.
• Deforestation: This practice actually increases soil erosion by removing trees that protect the soil.
• None of the above: This option is incorrect since afforestation does prevent soil erosion.

In summary, afforestation is the effective method for preventing soil erosion among the options listed.