Look at Table 24.4. What is easier to control—toxic chemicals leaching out of landfills or toxic chemicals in surface runoff? Defend your answer.

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TABLE 24.4 COMMON KINDS OF WATER POLLUTANTS Organic Chemicals Fertilizers; pesticides; detergents; plastics; petroleum products, including gasoline and oil Inorganic Chemicals Metals; acids; salts Toxic Chemicals Chemicals that are poisonous to living things, including heavy metals such as arsenic and mercury; many industrial chemicals; some household chemicals, such as paint thinner and motor oil Physical Pollutants Heat; suspended particles, such as soil; litter, including fishing nets and plastic objects such as six-pack rings Pathogens Organisms that cause disease, such as bacteria and viruses; pathogens in untreated sewage and animal feces that are washed into the water Organic Matter Remains of organisms, including carcasses, feces, and plant material