Which of the following are not differences between an eruption column and pyroclastic flow?

A) Tephra in an eruption column mostly cools before it reaches the ground.
B) A pyroclastic flow mostly flows downhill, whereas a column rises at first.
C) Damage from an eruption column can be more widespread.
D) Pyroclastic flows form from a higher gas flux.


D) Pyroclastic flows form from a higher gas flux.

Environmental & Atmospheric Sciences

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Indicate whether the statement is true or false

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Scientists attribute the recent rise in atmospheric concentrations of nitrous oxide (N2O) primarily to

A) automobile combustion. B) agricultural activity. C) wastewater management. D) industrial practices.

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Which of the following best describes the Mercalli earthquake scale?

A. Is a quantitative measure of earthquake intensity. B. Is a qualitative measure of earthquake intensity. C. Measures the amplitude of the strongest S-wave. D. Measures the amplitude of the strongest P-wave. E. Measures the amplitude of the strongest surface wave.

Environmental & Atmospheric Sciences