In the United States since 1920, many situations have changed because of the move to urban areas. What is one of these changes?
A. substandard housing
B. better working conditions
C. increased incidence of infectious diseases
D. increased water quality problems
E. poorer air quality
Answer: B
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Phil paddles his canoe at 8 m/s in still water. Keeping this speed he then paddles upstream in a river that flows downstream at 6 m/s. To his friend sitting on shore, Phil's speed is
A. 10 m/s. B. 8 m/s. C. 2 m/s. D. 6 m/s.
Which statement about the solar nebula is false?
A) It is formed as gas and dust spin faster and faster. B) It will eventually become a Sun. C) It will form stars and planets. D) It requires the Sun's energy to spin.
Air in an anticyclone
A) converges aloft. B) flows along the surface toward the center of the high. C) is moved by strong horizontal pressure gradients. D) cannot be affected by a jet stream. E) all of the above
Drainage density refers to
A) the thickness of the water in the stream. B) the number of channels in an area. C) a measure determined by dividing the length of all the the channels by the area of its drainage basin. D) the arrangement of channels in a given area.