Geological eras are subdivided into
A) eons
B) periods
C) epochs
D) ages
B
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The diagram below illustrates the layout and light path of a reflecting telescope of the ____________________ design
What is true of spiral galaxies?
A) They are much less common at larger redshifts. B) They are relatively rare in regions of high galaxy density. C) They are only found in the center of rich galaxy clusters. D) They have never been seen to have large redshifts. E) They evolve from giant ellipticals.
When light is refracted, there is a change in its
A) frequency. B) wavelength. C) both of these D) neither of these
When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction
a. is an acid–base reaction. b. is endothermic. c. never reaches equilibrium. d. is exothermic.