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.
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Indicate whether the statement is true or false
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.
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.