The document discusses soil contamination, including its causes, types, and effects. Some key causes of soil contamination mentioned are industrial emissions, waste, agricultural fertilizers and pesticides, and erosion. Soil contamination changes the chemical, physical, and biological composition of soil, reducing its fertility and negatively impacting plant and animal life. Contaminated soil can also pollute ground and surface water. The main human activities that protect soil from contamination include sustainable farming practices, erosion prevention, proper waste management, limiting industrial pollution, and soil remediation.