What proportion of sulfur compounds in the atmosphere come from natural sources?

A) 1/10
B) 1/5
C) 1/3
D) 2/3


Answer: D

Environmental & Atmospheric Sciences

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Approximately how old is the oldest oceanic crust?

A. 200 million years old B. 2 million years old C. 20 million years old D. 2 billion years old

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Which continent contains 60% of the world's population?

A) Asia B) Africa C) North America D) South America E) Africa

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Dry climates are always at low latitudes (within 10° of equator)

Indicate whether the statement is true or false

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Which of the following is true of pyruvate kinase?

A) It is activated by AMP. B) It plays a key regulatory role in glycolysis. C) both a and b D) neither a nor b

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