________ eruptions are common first phases in the eruptions of volcanoes as they "clear their throats" before emitting larger eruptions.
A. Icelandic-type
B. Vulcanian-type
C. Surtseyan-type
D. Plinian-type
E. Hawaiian-type
Answer: B
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The frictional force in the atmosphere
A) stays roughly the same up to an altitude of about 4 kilometers. B) varies depending upon the nature of the Earth's surface. C) accelerates winds near the surface. D) is independent of wind speed. E) is zero at the equator.
Which of the following compounds is used as an antacid?
A) NaHCO3 B) NaNO3 C) Na3PO4 D) Na2SO4
Approximately how long was the settled area around the Rio Grande River controlled by the Spanish before New Mexico and Texas became part of the United States?
A) 50 years B) 100 years C) 200 years D) 300 years
Which factor exerts the greatest control over the velocity of debris flows and the distance they will travel?
A) Debris content B) Water content C) Slope angle D) Vegetation