What is the discharge of a stream with a velocity of 2 meters/sec that is 5 meters wide by 3 meters deep?
A. 6 cubic meters/s
B. 10 cubic meters/s
C. 15 cubic meters/s
D. 30 cubic meters/s
D. 30 cubic meters/s
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Abyssal Plain is a broad, uneven region of the ocean that lies at least 4.5 km below sea level.
a. true b. false
What characterizes rates of natural population growth in the first stage of demographic transition?
A) often negative B) relatively low, often fluctuating around zero C) relatively high, which indicates economic progress D) extremely high, which reflects improvements in medicine E) the rates cannot be calculated
Thunder is caused by ________.
A. the compression of free photons in the lightning bolt B. high temperatures of lightning that flash heat the surrounding air, causing it to expand explosively C. the compression of free electrons in the lightning bolt D. the combustion of flammable atmospheric gases by the lightning bolt E. the compression of free neutrons in the lightning bolt
The nebular hypothesis explains the formation of ________.
A. the Moon B. the universe C. our solar system D. Venus's atmosphere E. black holes