Protecting soils can protect what?

• A. Water quality (soil effectively cleans and filters water that moves through it)
• B. Increases rainfall
• C. Decreases soil fertility
• D. Increases erosion

Answer: (A)

Protecting soils helps water quality because soil acts as a natural filter and sponge. When soils are healthy and well structured, they absorb water, slow down runoff, and trap sediment, nutrients (like nitrogen and phosphorus), and other pollutants. This keeps more of the pollutant load from reaching streams, rivers, and lakes, so water stays clearer and healthier for aquatic life and for people who rely on it. Erosion sends soil particles and attached contaminants into waterways, so reducing erosion through soil protection directly lowers sediment and nutrient pollution.

Other ideas about rainfall, fertility, or erosion aren’t tied to soil protection in the same way. Rainfall levels come from climate, not from protecting soil. Protecting soil doesn’t decrease fertility; it helps maintain or improve fertility by preserving soil structure and organic matter. And soil protection reduces erosion, rather than increasing it, by preserving vegetation cover and soil stability.