Household waste is typically disposed of in landfills or through waste management systems, rather than directly contaminating soil.

Petroleum hydrocarbons, such as gasoline and oil, are common contaminants found in soil due to improper disposal or leaks from storage tanks.

Pesticides, when used excessively or improperly, can contaminate soil and groundwater, posing risks to human health and the environment.

Heavy metals, such as lead and mercury, are inorganic contaminants that can accumulate in soil over time, posing risks to human health and the environment.

Erosion, weathering, and volcanic eruptions are natural processes that can release contaminants into the soil, such as heavy metals and radioactive materials.

Radioactive contamination occurs when radioactive materials, such as uranium or plutonium, are released into the soil, posing risks to human health and the environment.

Soil contamination is typically associated with negative health effects, such as cancer, birth defects, and neurological disorders, rather than improved immune system function.

Soil sampling and analysis is the primary method used to determine the presence and extent of soil contamination, as it allows for the quantification of specific contaminants in the soil.

Fertilizer application is not typically used as a remediation strategy for soil contamination, as it may exacerbate the problem by adding additional contaminants to the soil.

Natural attenuation refers to the natural processes that reduce the concentration of contaminants in soil over time, such as biodegradation, volatilization, and adsorption.

Pesticide use is not typically a source of heavy metal contamination in soil, as pesticides do not contain significant amounts of heavy metals.

Organic contamination refers to the presence of organic compounds, such as solvents and pesticides, in soil, which can pose risks to human health and the environment.

Soil contamination typically has negative consequences, such as groundwater contamination, air pollution, and food chain contamination, rather than improving soil fertility.

Phytoremediation is the process of using plants to absorb and accumulate contaminants from soil, thereby reducing their concentration.

Natural weathering of rocks is not typically a source of radioactive contamination in soil, as most rocks do not contain significant amounts of radioactive materials.