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
Indicate whether the statement is true or false
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Compared to the Earth's crust as a whole, the depth of sedimentary rocks beneath the ocean bottoms are ________
A) very thin B) not commonly found C) laid down vertically instead of horizontally D) much sandier E) found almost as deep as in the Moho
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