Which factor is NOT a climate factor but can influence contaminant movement?

• A. Soil characteristics
• B. Annual precipitation
• C. Temperature
• D. Wind speed

Answer: (C)

Contaminant movement is shaped by both the environment and the medium it moves through. The key idea here is that the properties of the soil itself set the pathways and rates of transport, independent of weather or climate. Soil characteristics such as texture, structure, organic matter content, porosity, and sorption capacity determine how a contaminant sorbs to the solid phase, how fast it diffuses, and how readily water can carry it. These intrinsic soil properties govern mobility by controlling retardation and flow paths, so they’re not climate factors.

In contrast, climate-related factors like precipitation, temperature, and wind speed influence transport by altering water fluxes, infiltration versus runoff, evaporation, and volatilization. They shape how much water moves, how fast contaminants can travel with that water, and how far plumes might spread under given weather conditions.

So, the factor that is not a climate factor but can influence contaminant movement is the soil’s own characteristics, because they define the movement pathways themselves rather than the atmospheric or hydrological conditions that drive transport.