The document discusses soil pollution. It defines soil pollution as the build-up of toxic compounds, chemicals, salts, radioactive materials, or disease-causing agents in soils that have adverse effects on plant growth and animal health. Some common causes of soil pollution include seepage from landfills, industrial waste discharge, pesticide and fertilizer overuse, and deforestation. The document outlines different types of soil pollution and their effects, and provides some methods for controlling soil pollution such as reducing chemical usage, recycling, and reforestation.