The polar vortex
A) brings warm air poleward.
B) is located in the lower troposphere.
C) is caused by a temperature gradient.
D) consists of strong easterly winds.
E) all of the above
C
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A dome-shaped mass of glacial ice covering less than 50,000 km2:
a. cirque d. ice cap b. glacial striation e. valley glacier c. moraine
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Which of the following is NOT a way in which volcanic domes are commonly destroyed?
A. collapse into emptied magma chambers below B. internally derived explosions from built-up gas pressure C. collapse of steep flanks into block and ash flows
The greatest danger from pyroclastic flows is ________
A) being buried in ash. B) not significant because they move so slowly they can be avoided. C) being incinerated by the hot gas and entrained magma. D) being smothered by hot gases and ash.