Question

Which of the following describes how freshwater resources are threatened in urban areas?



chemical residue collected from streets in rain runoff


contamination due to power plant emissions


chemical residue in rivers that sustain water sources

contamination due to littering from urban residents

Answer 1

Answer:

b or c

Explanation:

Answer 2

Answer:

Chemical residue collected from streets in rain runoff

Explanation:

All choices are contaminant sources. But contamination due to power plant and chemical residue in rivers that sustain water sources are not limited to urban areas.

Of the two remaining choice, contamination due to littering from urban residents has less impact than chemical residue collected from streets in rain runoff.