The frequency of something within a given unit of area is

A) concentration.
B) density.
C) distribution.
D) pattern.
E) dispersion.


Answer: B

Environmental & Atmospheric Sciences

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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.

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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

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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.

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Which of the following is the name given to a packet of electromagnetic radiation?

A) phonon B) phonton C) phason D) photon

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