What was unusual about the 1980 eruption of Mt. St. Helens?
A. The small size of mudflows that were formed
B. A flank eruption occurred
C. The thickness of lava flows produced
D. A lateral blast
Answer: D
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A(n) ________ is the term used to describe the total amount of any given geologic material of potential economic interest, whether discovered or not.
A. aggregate B. reservoir C. ore deposit D. reserve E. resource
Which of the following conditions is necessary for a layer of altostratus clouds to change into alt°Cumulus?
A. The cloud layer becomes more stable. B. The top part of the cloud deck cools while the bottom part warms. C. The cloud layer mixes. D. Temperature increases with increasing altitude in the layer.
Hydrogen fuel cells power automobiles by ________
A) generating changes in gas pressures that move pistons in car engines B) generating electricity C) combining with equal parts of gasoline to create a fuel with extra octane D) creating rapidly combustible hydrogen compounds
On the accompanying figure, what type of feature is located in the area of letter D????
?
A. mid-ocean ridge B. fracture zone C. transform fault D. linear island chain