environmental science

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Malathion is an insecticide that is fairly widely used in the United States, with a half-life in the environment of 1 day. If 100 grams of malathion are released into the environment, about how much will remain after 4 days?

Human wastewater results in which of the following water-pollution problems? I. The organic matter decomposes and reduces dissolved oxygen levels. II. Decomposition of organic matter releases great quantities of nutrients. III. Pathogenic organisms a

The beneficial ozone is ____ and the dangerous ozone is ____.

Natural sources of air pollution include all of the following except

The United States legislation that empowers the EPA to establish maximum contaminant levels in drinking water is the

Which of the following gases is the greatest overall contributor to the greenhouse effect?

When a chemical manufacturing company develops a chemical, extensively tests it, discovers it to be unsafe, and never brings it to market, it is following the

Which of the following molecules is NOT considered a greenhouse gas?