How does mercury enter the environment? A. Only when factories burn the elemental mercury.
B. When mercury-containing items are burned or thrown away.
C. Only through chemical reactions in the air from factories.
D. When mercury is used in medical treatments.
How does mercury enter the environment?
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The correct answer is: B. When mercury-containing items are burned or thrown away.
Explanation: Mercury can enter the environment in various ways, including when products that contain mercury, such as thermometers, batteries, and light bulbs, are disposed of improperly or incinerated. This can release mercury into the air, soil, and water. While factories do contribute to mercury pollution, the options provided specify ways in which mercury directly moves into the environment, making option B the most comprehensive choice.