Which of the following is NOT an important function of Earth's atmosphere?

A) Insulates the surface against temperature extremes
B) Maintains a water supply
C) Supplies the oxygen for life
D) Screens out much of the Sun's ultraviolet radiation
E) Maintains an envelope of pure oxygen


Answer: E

Environmental & Atmospheric Sciences

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The unit 1 ppm is equivalent to which of the following?

A) 1000 ppb B) 0.0001% C) both a and b D) neither a nor b

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Which of the following can cause enzyme activity to either increase or decrease?

A) changing the temperature B) increasing the substrate concentration C) both a and b D) neither a nor b

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What are the major causes and effects of climate change?

What will be an ideal response?

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