Support Near many cities, contamination of lakes and rivers from pollutants in rainwater runoff exceeds that from industrial discharge. ██ ███ ██████ ██████ ████ █████████ ███ ██████████ ██ █████ ██ ███ ███ █████ ███████████ █████ █████ ██████ ██ █████ ███ ███████ █████ ██████████
Water itself is one of the biggest water polluters. Why? Around many cities, pollution from runoff is greater than from industrial discharge. How? Water running over buildings and pavements picks up oil and other pollutants.
This is evidence used to support that water is one of the biggest water polluters by showing water pollutes more than another big pollution source. It is also a sub-conclusion. The statement explaining how water picks up oil and contaminants supports it.
The statement that contamination of █████ ███ ██████ ████ ██████████ ██ █████████ ██████ ███████ ████ ████ ██████████ █████████ █████ █████ ███ ██ ███ █████████ █████ ██ ███ █████████
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The support relationship works the other way. The fact that water pollutes more than industrial discharge is evidence for why water is one of the biggest polluters.
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The stimulus makes no claims about how serious the pollution is from any given source. It talks only about the amount of pollutants.
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While that observation helps explain why water pollutes so much, the statement in question is not a generalization stemming from that observation. It is a comparative measurement against industrial pollution.
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This evidence, that water pollutes more than industrial discharge, helps make the case that water is one of the biggest water polluters.
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It notes a pattern that appears near many cities. It works to support the conclusion, not illustrate an example of city pollution.