Leaching results in groundwater contamination as chemicals are carried into groundwater. Which description best explains this process?

Leaching results in groundwater contamination as chemicals are carried into groundwater. Which description best explains this process?

• A. Leaching reduces soil nutrients
• B. Leaching is when chemicals seep into soil with rainfall, contributing to groundwater contamination
• C. Leaching purifies water
• D. Leaching only occurs in deserts

Answer: (B)

Leaching is the downward movement of dissolved substances through soil as infiltrating water moves, carrying chemicals into groundwater. When rainfall soaks into the soil, water percolates downward and dissolves soluble substances such as nitrates, pesticides, or salts. This leachate then reaches the saturated zone and can enter groundwater, causing contamination. It’s not about purifying water, and it isn’t limited to deserts; it can occur in many soils depending on rainfall, soil structure, and the solubility of the contaminants.

Leaching is the downward movement of dissolved substances through soil as infiltrating water moves, carrying chemicals into groundwater. When rainfall soaks into the soil, water percolates downward and dissolves soluble substances such as nitrates, pesticides, or salts. This leachate then reaches the saturated zone and can enter groundwater, causing contamination. It’s not about purifying water, and it isn’t limited to deserts; it can occur in many soils depending on rainfall, soil structure, and the solubility of the contaminants.