A line of equal longitude is called a(n) ______________
Fill in the blank(s) with correct word
meridian
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How does the interstellar medium obscure our view of most of the galaxy?
A) The small mixture of dust grains in the interstellar medium absorbs visible light. B) Dust reflects most light from distant regions of the galaxy back towards the source. C) Hydrogen gas produces so much visible light that the interstellar medium is opaque, blocking our view of anything beyond it. D) Molecules in the interstellar medium absorb all wavelengths of light. E) all of the above
A boat moves at 10.0 m/s relative to the water. If the boat is in a river where the current is 2.0 m/s, how long does it take the boat to make a complete round trip of 1.00 km upstream followed by a 1.00 km trip downstream?
When a vapor condenses
A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.
Planets in a planetary system other than the solar system
a. have never been detected. b. have been detected. c. are an impossibility. d. are universally present.