The largest known galaxies are ________
A) irregular B) round C) elliptical D) spiral E) barred spiral
C
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Why does the moon have more of an impact on tides than the sun?
a. The size of the moon is more in balance to Earth. b. The moon is closer to Earth. c. The sun has more power over the tides than the moon. d. Earth revolves around the sun. e. The moon revolves around the sun.
The symmetrical pattern of magnetic polarities about spreading ridges in oceanic crust basalts
indicates that:a. each plate has had an independent set of magnetic reversals. b. basalt retains its magnetic signature for only a few million years. c. new ocean crust is created by volcanism at oceanic ridges and old crust moves laterally away from the ridge. d. the oceanic crust is geologically young. e. magnetic polarity reverses but northern and southern hemispheres do not.
An extremely strong downslope wind that occurs in parts of Antarctica would be considered a
Santa Ana wind. a. true b. false
The spectra of most stars are dark-line spectra because ________
A) elements in the Sun's outer atmosphere absorb in these dark-line bands, blocking the radiation in those bands B) electrons decaying to a lower energy state emit a photon at a fixed energy, leaving dark bands between the emissions C) elements in the Sun's outer atmosphere emit radiation between these dark bands D) elements in the earth's atmosphere absorb in these dark-line bands, blocking out the frequencies in the dark bands