According to the polar front theory,
A) midlatitude cyclones create fronts in the polar regions.
B) midlatitude cyclones form in front of several large air masses.
C) midlatitude cyclones form along a boundary separating polar air and warmer air to the south.
D) midlatitude cyclones form along a boundary separating frigid Arctic air with slightly colder polar air.
Answer: C
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The one place on Earth where mid-oceanic ridge volcanism occurs above sea level is
____________________. Fill in the blank(s) with the appropriate word(s).
Which of the following best matches the description?Measure of toxicity or the dosage that will kill 50% of a tested population.
A. hazardous wastes B. chronic toxicity C. waste minimization D. ignitability E. LD50 F. synergism G. National Priority List H. RCRA I. threshold levels J. acute toxicity K. CERCLA L. Superfund M. toxicity N. reactivity O. corrosiveness
Surface ocean currents circulate in ocean basins:
a) clockwise in the northern hemisphere b) clockwise in the southern hemisphere c) counterclockwise in the northern hemisphere d circulation directions are not systematic e) both b an c
Which of the following is not an anthropogenic biome?
A) residential rangelands B) populated forest C) pastoral village D) boreal and montane forest