Soil contamination is when there is something in the soil that is bad and can hurt people, animals, or plants. This bad thing can come from different places like factories, landfills, or farms where chemicals are used. These chemicals can get into the soil and when people and animals walk, play, or eat things from the soil, it can make them sick. Plants can also be harmed if they take in the bad chemicals. Sometimes it is hard to tell if the soil is contaminated, so it's important to stay away from soil that may be contaminated.