Draw a sketch to show where eddies can form when air blows rapidly over a mountain range. Show on your sketch where you might expect eddies and clouds to form
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ANSWER: Students answers may vary, but the sketch needs to illustrate that eddies that form downwind from obstacles can produce a variety of interesting effects. Wind moving over a mountain range in a stable atmosphere with a speed greater than 40 knots usually produces waves and eddies. We can see that eddies form both close to the mountain and beneath each wave crest. These are called roll eddies, or rotors, and have violent vertical motions that produce extreme turbulence and hazardous flying conditions. Strong winds blowing over a mountain in stable air sometimes provide a mountain wave eddy on the downwind side, with a reverse flow near the ground.
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A neutral molecule, such as water, can form an ion when it
A. fragments into protons and electrons. B. absorbs electrons and become negatively charged. C. combines with a chloride ion to form a negatively charged species. D. combines with a hydrogen ion to form a positively charged species. E. absorbs electrons and become positively charged.
The Precambrian comprises what percent of geologic time?
a. 99% b. 88% c. 77% d. 66% e. 55%
Eastern North America during the Cenozoic can be described as a(n):
a. active orogenic belt. b. area of uplift and erosion. c. active volcanic region. d. flat, eroded plain. e. major marine basin.
How were South Africans, under apartheid, considered foreigners in their own land?
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