The frequency of something within a given unit of area is
A) concentration.
B) density.
C) distribution.
D) pattern.
E) dispersion.
Answer: B
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The elements found on Earth have much to do with
A) white dwarfs. B) neutron stars. C) pulsars. D) quasars. E) supernovae.
The large cross beds in these rocks indicate that the sediment was deposited
A. deep in the ocean. B. by a debris flow. C. in a lake with a gently sloping bottom. D. by the wind or a water current. E. All of these choices are correct.
During the 1950s, people lived on average more than two decades longer in developed countries than in developing ones. In the twenty-first century, the gap is ________
A) less than 5 years B) less than 10 years C) less than 15 years D) still the same E) increased to 30 years
Which of the following is the name given to a packet of electromagnetic radiation?
A) phonon B) phonton C) phason D) photon