The fast, downslope movement of large blocks of weathered materials is known as a
a. solifluction.
b. slump.
c. rock flow.
d. landslide.
d
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Nanometer is a unit of _____
A) frequency B) energy C) mass D) length
Why isn't space expanding within systems such as our solar system or the Milky Way?
A) Hubble's law of expansion applies only to the space between galaxies. B) We are so close to these systems that we don't observe their expansion. C) The universe is not old enough yet for these objects to begin their expansion. D) Their gravity is strong enough to hold them together against the expansion of the universe.
The combining of two nuclei to form a larger nucleus with the release of energy is nuclear fusion
a. True b. False Indicate whether the statement is true or false
This photo shows the visible light spectrum of the Sun. Why does it have all those dark lines on it?
A) The dark lines represent wavelengths of light at which atoms near the Sun's surface absorb radiation from the hotter solar interior. B) The dark lines come from sunspots on the Sun, which are dark in color. C) The dark lines are caused by Doppler shifts. D) The dark lines are not real, but rather are artifacts of the photographic process used to record the spectrum.