An important natural source of which of the following chemicals comes from volcanoes?
A. ozone
B. benzene
C. carbon monoxide
D. sulphur dioxide
Answer: D
Environmental & Atmospheric Sciences
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Blood flowing back to the heart travels in
A. capillaries. B. veins. C. arteries. D. all of the above
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Lake-effect snow is primarily a problem ____ of large lakes
a. ?around the entire border b. ?in the center c. ?to the north d. ?to the south e. ?downwind
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In a(n) ____ bond, elements share electrons
a. ionic b. van der Waals c. electromagnetic d. covalent e. noble
Environmental & Atmospheric Sciences