Final answer:
Groundwater contaminants can be classified into three types: soluble, dense insoluble, and light insoluble. Soluble contaminants dissolve in water, while dense insoluble contaminants sink to the bottom of the aquifer and light insoluble contaminants float on top of the water.
Step-by-step explanation:
Groundwater contaminants can include a broad range of physical, inorganic chemical, organic chemical, bacteriological, and radioactive parameters. Some common types of groundwater contaminants are soluble contaminants, dense insoluble contaminants, and light insoluble contaminants. Soluble contaminants can dissolve in water and include substances like nitrate and pesticides. Dense insoluble contaminants, like heavy metals, sink to the bottom of the aquifer. Light insoluble contaminants, like oil and gasoline, float on top of the water.
Answer: a) soluble, dense insoluble, light insoluble