Active periods in a volcano's history
A. always begin with a nuée ardente.
B. typically involve only one significant eruptive phase lasting days or, at most, a few weeks.
C. may occur at intervals of hundreds or thousands of years, with quiet periods in between.
D. All of the choices are correct.
Answer: C
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A) Sino-Tibetan B) Altaic C) Dravidian D) Afro-Asiatic E) Austronesian
Rounding is
A. a type of mineral B. the rounding of a grain to a spherical shape C. the grinding away of sharp edges and corners of rock fragments during transportation D. None of these choices are correct.
The most frequent time of day for tornadoes to form is in the ____
a. early morning just after sunrise b. late morning just before noon c. evening just after sunset d. late afternoon e. middle of the night
The slowest and least perceptible form of mass wasting is ________
A) mudflow B) creep C) landslide D) solifluction E) exfoliation