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Soil erosion occurs when soil is worn away by the natural action of wind, water, and ice or by deforestation and poor farming practices. If soil erosion continues for a long time, it can lead to the formation of deserts. Some scientists estimate that the world lost about 20 per cent of its farm topsoil between 1950 and 1990. Contour plowing, planting trees to serve as windbreaks, and other techniques can all reduce soil erosion. Which of the following statements is supported by the information above?

Explanation

The best answer is Choice D. The first sentence mentions several causes of soil erosion. These include natural actions, such as wind, water, and ice, along with human actions, such as deforestation and poor farming practices.

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