The average speed of a horse that gallops a distance of 10 km in a time of 30 min is
A) 10 km/h.
B) 20 km/h.
C) 30 km/h.
D) more than 30 km/h.
B
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The natural materials most commonly associated with earth failures are ________.
A. basalt B. pahoehoe C. granite D. quartz E. clay minerals
Which of the following hydrothermal vent fields is thought to be driven by serpentinization?
A) Coaxial B) Guaymas Basin C) Lost City D) Lucky Strike E) Tubeworm Barbeque
Multibeam provides the best modern technique for obtaining seafloor bathymetry, so why hasn't it been used for the entire ocean?
A) It doesn't work where there is ice. B) It is too expensive, requiring many ships many years to survey the entire ocean. C) It doesn't work in deep water. D) Oceanographers simply haven't had time to process all the data.
Which of the greenhouse gases are the most significant contributors to global warming? How do they work?
What will be an ideal response?