Which of the following is false as regards the jet streams?
A) The polar jet stream and subtropical jet stream may appear over North America simultaneously.
B) The polar jet stream can migrate as far south as Texas, steering colder air masses into North America.
C) They weaken during each of the hemisphere's summer and strengthen during its winter.
D) The pattern of ridges and troughs causes variations in jet stream speeds.
E) They have no known effect on surface weather systems.
E
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A) twice B) three times C) almost 7 times D) nearly 10 times
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A) are calm B) blow parallel to the front and in opposite directions C) blow away from the front and are of equal strength D) blow against each other and are of equal strength
During the 2010 Winter Olympics Canada did not have enough natural snow for some of the events. This was largely due to the fact that it was an El Nino year
Indicate whether the statement is true or false
Which of the following processes is NOT considered physical weathering?
A. thermal expansion B. near-surface fracturing C. frost wedging D. oxidation E. prying by plant roots