About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. The remaining two-thirds come from human activities such as ____.
A. automobile exhaust
B. airplane exhaust
C. plastic recycling
D. gold mining
E. livestock farming
Answer: D
Environmental & Atmospheric Sciences
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Sir Isaac Newton built and used reflecting telescopes
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