Which statement explains a cause for sea level to fall?
A) ?Periods of global glaciation trap ocen water in land-based glaciers.
B) ?Global warming causes seawater to expand and occupy more volume.
C) ?High rates of seafloor spreading causing expansion in volume of oceanic ridges.
D) ?Sediments shed by the continents during periods of rapid erosion occupy more volume.
Answer: A) ?Periods of global glaciation trap ocen water in land-based glaciers.
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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 human activity is leastlikely to be a major threat to marine systems?
A. overfishing B. sinking of ships to create artificial reefs C. runoff of nonpoint source pollution D. invasive species introduced by humans E. habitat destruction from coastal development
Recorded temperatures on Earth range from
a. ?-40 to 120 degrees Fahrenheit. b. ?-55 to 115 degrees Fahrenheit. c. ?-100 to 150 degrees Fahrenheit. d. ?-111 to 159 degrees Fahrenheit. e. ?-121 to 122 degrees Fahrenheit.
The "average" speed of a cold front is about half that of an "average" warm front
a. True b. False