Compared to Earth, Venus has:
A) a more transparent atmosphere.
B) a lower average surface temperature.
C) a far greater percentage of its surface in low-level ocean basins.
D) about the same percentage of its surface in raised continents.
E) a far greater percentage of its surface in raised continents.
C
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A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the electric field 10.0 cm from the center of the sphere?
A. 
inward
B. 
outward
C. 
inward
D. 
outward
E. 0
Why is the sky blue (on Earth)?
A) because molecules scatter blue light more effectively than red light B) because the Sun emits mostly blue light C) because molecules scatter red light more effectively than blue light D) because deep space is blue in color E) No one knows; this is one of the great mysteries of science.
Based on counting the number of galaxies in a small patch of the sky and multiplying by the number of such patches needed to cover the entire sky, the total number of galaxies in the observable universe is estimated to be approximately
A) 10 billion. B) 100 million. C) 100 billion. D) 1 trillion. E) 1 billion.
Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.