Which process in the hydrologic cycle is most effective at increasing ocean salinity on a global scale?
-evaporation
-precipitation
-stream runoff
-melting glaciers
-river discharge
-evaporation
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What is generally the range of a star's hydrogen burning lifetime?
A. from 2 billion to 15 billion years B. from 20 billion to 100 billion years C. from a few hundred thousand to 20 billion years D. from a few million to 50 billion years
Which of the following would be a common diameter for a tornado?
A) 40 meters B) 400 meters C) 4,000 meters D) 40,000 meters E) 400,000 meters
A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second squared is
A) 1. B) 2. C) 5. D) 10. E) none of the above
According to researchers at University of Colorado Denver, what was the most important factor in the high number of home runs at Coors Field?
A) The lower temperatures help athletes not to overheat. B) The thin air allows the batter to obtain better auditory cues about the pitch. C) The predominant summer wind direction is in favor of the batter. D) The thin air allows the ball to fly further.