Conditions necessary to turn an ordinary thunderstorm into a tornado-spinning monster include ________.
A. a cold, dry air mass moving down from Canada or out of the Rocky Mountains at > 50 mph
B. a low-altitude, northerly flow of warm, humid, tropical air from the Gulf of Mexico and a cold, dry air mass moving down from Canada or out of the Rocky Mountains at > 50 mph only
C. jet-stream winds racing east at speeds in excess of 150 mph
D. All of these choices are correct.
E. a low-altitude, northerly flow of warm, humid, tropical air from the Gulf of Mexico
Answer: D
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Which of the following lines of evidence did Alfred Wegener use to support the concept of drifting continents?
a) the distribution of species of fossils b) the way the shapes of the continents fit together like pieces of a jigsaw puzzle c) the composition of meteors from outer space d) the pattern of similar mountain belts on different continents e) evidence of glaciers in areas that are now tropical
To define a riparian zone, a government agency will most likely use a vector-based buffering operation, rather than a raster-based physical distance measure operation. Why?
What will be an ideal response?
Which of the following blood cells are the largest?
A) erythrocytes B) monocytes C) neutrophils D) thrombocytes
Earth's largest mountains are found
A. in the Indian subcontinent. B. under the sea. C. in the western U.S. and Canada. D. forming the mountainous backbone of western South America.