The mass density of pure water is 
If the molecular mass of water is 18.0 u, how many water molecules are in spherical water balloon of radius 1.0 cm?
A. 
B. 
C. 
D. 
C.
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Which of the following phenomena is not thought to be a result of collisions or other interactions between galaxies?
A) the presence of large, central dominant galaxies in clusters of galaxies B) the fact that elliptical galaxies are more common in clusters of galaxies than outside clusters C) starbursts D) the fact that spiral galaxies have both disk and halo components
A freely-falling watermelon falls with constant
A) velocity.
B) speed.
C) acceleration.
D) distances each successive second.
Which of the following is fundamentally different from the others?
A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves
Which one of the following is not a type of plate collision?
A) continental divergence B) oceanic-continental C) continental-continental D) oceanic-oceanic